My lineup might be a little biased, but upon a closer look you'll see that my top 4 are all characters with success in multiple environments.
Nova took home the Ultratitle, which I feel was the granddaddy win of 2007 for anything FWrestling.com related. Rather than being accused of any bias, I'll say that Chris has done an exemplary job with the character's FW development. Furthermore, once you factor in the TEAM Champions of Champions victory over Dan Ryan, that's why I think he tops the list.
Ryan comes in a close 2nd through his A1E and CSWA title wins, and he's now positioning himself strongly in NFW and NAPW as well. I gave Hiroshi the nod over Sean Stevens because of his higher ranking in EPW than Stevens in CSWA or NFW. Both have been great World Champions for their respective feds through the last half of the year. YYJ rounded out my top 5 for finishing as the runner-up to Nova in the Ultratitle, but also making some very strong showings in TEAM.