I started out with regular default messages, but then i found it to be too slow. i think switched to GoMessages and it was ok at first, but with the new update things have really slowed down again. is there a simple text messaging app that is FAST?!
Chomp SMS, Go SMS and Handcent SMS are the three most popular messaging apps. I use Chomp and find it very good to use. Perhaps one of the other two will be best suited for your needs.