I've tried using Go SMS, its a great messaging application, has a lot of features, a lot of themes to choose from but it uses alot of RAM on my phone so I went back using Handcent for that matter.. This two apps are both great on their own rights, I love Handcent because there's an option where you can display your contact's pic and yours in the threaded conversation so it appears to be like a comic style conversation...what I love in Go SMS is that it has a function where you can schedule your SMS to be sent.. But I've chosen Handsent on my vote. there you go!