I just bought a buddy's (2003) Bushmaster M4A2 (fixed carry handle) with @ 1000 rounds for $700.00. If I had to do it again, I'd much rather have the A3 model. I'd dump that carry handle and take the options for different sights/scopes. Then again, the A2 has bennies for a solid sight set up (can be knocked around more), compared to exposed BUS (back up sights) or scopes. Take your pick; just remember you have NO option to remove the handle on the A2 version, but it can be scoped.
No one reads or cares what is written in ones signature box. So I'm not writing anything worth reading or remembering.