Brent,
I went through the same decision awhile back and I decided on the Colt for the following reasons:
- Came standard with 1/7 twist
- Came standard with M4 hand guards
- Came standard with M4 feed ramps
- Came standard with side sling mount
- Had the RAS numbers on the flattop
- Had "M4 Carbine" stamped on the lower (I know it's dumb and adds nothing to the rifle but I thought it is was cool).
I thought the Colt was a better value for MY dollar, YMMV. This [url=http://www.jobrelatedstuff.com/forums/topic.html?b=3&f=118&t=159662&w=searchPop]
thread[/url] has a lot of great information and may help you with your decision too. Personally, I don't think you could go wrong with either the Bushmaster or Colt. I can't comment on the Olympic because I don't own one and have never shot one but I do know that they don't have chrome-lined barrels.