i've got to say the one that really excites me is that coradelle patterson kid. raw, but man can he move. dude has some decent height to him and a good frame. he's apparently a quick study and hard worker. his potential is through the roof and he's got what he needs to refine what he needs to quickly. i love the kid's versatility.
Like you, I don't do a lot of research until the draft nerds have narrowed down the field to a manageable number of candidates, then I'll take a look at the most likely candidates.
That said, I have looked at some tape (read YouTube highlights) of both Patterson and Allen. Patterson looks exceptional in the open field, but I was really turned off by his pass catching. Most of his receptions he was catching just like fielding a punt. He consistently lets the ball get into his body. Allen on the other hand, showed good hands and body control.
Take all that with a grain of salt though, as again, so far my "research" amounts to one YouTube highlight reel of each one of them. It is just something to keep your eye on as the process unfolds.