Welcome! Since the 2nd gen Neon is still pretty new, it may be awhile yet before more aftermarket parts come out for it. Another site you can check
www.howellautomotive.com They do a lot of Neon parts too and probably more for the first gen.
www.nopi.com may be good too.
Mine's pretty much some show no go. I had plans for NOS and possibly a custom made turbo system (from a friend's Neon) but a motor blowing on me 2 years ago kinda humbled me and I scrapped alot of plans. I just did a few simple things and just cruise it gently. My fiance Alex and I are going to start rebuilding the stereo system this weekend.
What other plans do you have?