1. TE: WR is huge too, but good TEs open up offenses  for everybody. The Bills still need a big receiver, but we have (semi) competent receivers. We have no presence at TE. Royal is a really good blocker, but is basically an afterthought in the passing game (for us and the defense). Gaines isn't special, gets open more than Royal, but dropped some key passes. Almost every good offense has a really good TE: NE, Indy, Dal, SD, GB, Pitt.
2. WR: Really need a good receiver. Almost a 1A, but I'm a big proponent of an active TE. SD has built a perennial contender with almost no WR play. This year with Chambers and Jackson the WR play got better, but LT and Gates are still the focal points of that explosive offense.
3. Fullback: Would love a solid blocker with some ball skills.
4. QB: Veteran backup. Really will just be a pick out of some average/below average qbs. Hopefully Trent will actually perform and this will remain a backup need. I would like to see a late round QB pick if value is there. Would like to see three qbs next year: Edwards, Veteran, Rookie. Still would like to see JP stick around, but keeping him doesn't seem to be much of an option now.

Losman fits the bill as a cheap, veteran QB.  He knows the system, and no commitment is needed from him or for him, since he just has one year left on a relatively cheap contract (I think any veteran will require more money and a steep learning curve).  We should also remember that injuries, much more so than performance, dictated playing time between these 2 QBs this year.  If and when Edwards goes down, I would much rather have Losman than a veteran always backup QB.  And, by the way, I think Losman will not attract more than a 4th-7th round pick.  As a backup, Losman is perfect and we don't need to go looking for one at a high price (maybe pick up a 3rd QB and groom him for the following year as a backup).

When i was watching every Bills game this season i really noticed that we did not a a consistent threat downfield or on the recieving end of the field at all.  Don't get me wrong, Evans is a great reciever and can make big time plays and is definatley our number one reciever but he is never a consistent big time threat and usually when a team places double coverage on him he is non-existent.  Not to mention we have other capable recievers in Price and Reed and a great option in Parrish in the slot.  But teams are not worried about our passing game at all.  This is where our management needs to improve in the off-season.  Now, while drafting a reciever is sometimes a hit-or-miss thing its something the Bills should look at.  A few names come to mind, the Bills could look at Adarius Bowman from Oklahoma State.  A big target to throw to (6'4, 220), he brings the big-play ability to the field. Isn't afraid to do crossing patterns and take a hit, if necessary. Should be a solid red-zone option with his size and athleticism.  In his final two seasons with Oklahoma he had over a thousand yards recieving and a total of 20 touchdowns.  Not a bad pick.  Limas Sweed from Texas would be another player to look at.  Very good size (6'5, 219) and strength. Speed is deceptive, which makes matchups favorable to him.  Mario Manningham from Michigan is great with ball control and can catch anything.  But I think his lack of size(6', 178) may not be what the Bills need.  Now while the Bills may not be able to get these players in the draft, it would be a bad idea to maybe make a play for them.  On the other hand making a play for some unrestricted free agents.  I know there are some top wide recievers out there like Bernard Berrian and Andre Davis(even though he was once a Bill, but hey Price came back)  that come to mind, as well as Patrick Crayton and the infamous Randy Moss that are top in free agency.  Now there are some other great recievers in the free agency market to look at but i would like to see the Bills make some offers to someone like Berrian.  Not saying that we would get him but he would be a great established reciever that brings a downfield threat as well as veteran experience.  And not to mention someone like that would bring confidence to Edwards, who will likely start.  As a second year quater back throwing to an established reciever would build good confidence in a young quarter, who's offense had struggled to throw downfield.  Not to mention that would open out Lynch's running game and with his talents i think our offense could vastly improve and surprise some teams.  Also if we can keep Evans somehow and either make and offer to a free agent or draft a reciever that would be a great one/two reciever combination.  Bye Bye Price and Reed.  Parrish is good and maybe keep a 3rd decent reciever, but nobody major.  But i think our recieving core needs improvement.  The only other area i can see that needs improvement is our run defense.