Definitely go for the A3 upper or an A4 upper with removable carry handle. If you are thinking about a forward vertical grip, flashlight, or aiming laser, get one of the modular handguard rigs. I recommend
LaRue Tactical for accessories. The folks at
Del-Ton are excellent too...
Wow, thanks very much for the links—there’s some great stuff on those sites! I made a deal with my wife—if Obama wins, then on NOV 5, I get to buy an M4. If McCain wins, I’ll still get it, but we’ll be able to put it off a bit longer.