Well, I was in a similar position to you as well. Got the M4 bug the moment I popped on to this site and saw someone posting their pics of a bowflage-camo'd M4. I hemmed and hawed, and ended up ordering a Bushy. Personally, I thought the Y-comp looked crappy, so I specified a straight 16" M4 profile barrel. I'm gonna snag some Colt M4 handguards and slap 'em on there. Probably gonna cost me a little under a thousand for everything, but worth it I think.
The one thing I'd recommend, due to my experience.......if you're going to go for a Bushy, try to hit sites like gunsamerica, or auctionarms. Find someone selling a rifle in the configuration you want, and get it that way. Guy at the shop told me three weeks. I took it with a grain of salt, and still no word whatsoever on when it'll show up. Bottom line is, if you're getting a Bushy ordered like I did, especially the M4, you're gonna wait a while.....