Don't worry about numbers and just go race to see what you're made of. One of the guys on here barely has an FTP of 200w and he's pretty wicked in a sprint. I used to have a 4.5w/kg FTP and the only way I could win a race is if I started my sprint from 10 miles out.
Given my lack of sprint, I had to attack and try to get away from everything. Cat 5's and 4's were frustrating for me because they chased every attack down like a pack of rabid beavers. The 3's was where I started having some success and fun.
Go find what works for you.