Top Ten AR-15 Models

What AR-15 do you think is the best? (Does NOT have to be an assault rifle, but please do not do AR-15 shotguns :P )
The Top Ten
1 M16A3
2 HK-M416
3 SOPMOD M4
4 M4A1
5 M4 Carbine
6 LR-300
7 REC-7
8 M16A4
9 M16A2
10 M16A1
The Contenders
11 XM177
12 ArmaLite
13 Bushmaster Carbon 15 R21
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