www.pbnation.com that is a good one IMO i frequent there alot. lots of info...tips and such.
your tippmann should shoot as far as any marker out there. just goto the chrono station and make sure you are shooting around the 300fps mark and you should do fine. i started with a spyder last year and now im running a 2k2 Intimidator. both run great. for $400 i would look into an Impulse if i were you. they are great, easy to maintain and look after.