Well, my friend, Crystal shot my AR and liked it (I think). I’ll throw my .02 in the hat.
I’m convinced the best way to buy an AR is to get a stripped lower and build the lower. Buy the upper complete. And buy a good upper, like a Bushy or a RRA. Check upper and parts kit prices locally and on the Internet. You can then buy this is pieces over a few months. Plus, you’ll save a little money.
I can help you with the lower build if you want. (Yea, like you need the help. You’re a damn mechanic! LOL.)
I’d go with an A3 upper and wouldn’t even bother getting the carry handle. For the cost of the carry handle (if not LESS), you can get a good BUIS. Start off with just those iron sights. When you can afford it, throw an Aimpoint on it. You can mount an Aimpoint forward of a carry handle, but the mounts and handle add extra weight. I personally just like having the Aimpoint right on the flattop.
The Bushy pencil barrel will help keep weight down. However, I’m not sure how much perceived difference there really is in a pencil and an M4 barrel like mine. The pencil barrel will get hot and lose accuracy quicker than the M4 (IIRC).
I’m also sold on the AAC rail and vertical grip I’ve got. For the price, you can’t beat it.
I know I just described my rifle, so maybe I’m just biased. But I did a lot of “trying things out” and research before I put mine together. And it sounds like what Crystal wants is almost exactly what I wanted. You know you’re welcome to come shoot mine whenever you want.