Im glad your not offended. I meant nothing by it. In fact I know guys who are doing builds and have a "standard" rifle they have fun with while they are building another. I wish I had that kind of dough. ;-(
Those three little letters you used in your post, "LMT" Ya really cant go wrong from what I have experienced with Lewis Machine and Tool. Are you going gas piston or not? They are nice but remember they are more parts and more opportunity for fail. If your building your own and maintaining it yourself the regular old stoner design works well. Same thing with the chrome molly barrel. Its nice but not really a must. I would rather have a nicer BCG than a chrome barrel anyday.
One little add on that I realy do like but ya have to train with a decent amount is the B.A.D. (Battery Asist Device). Several companies make them nowadays.
Here is a small clip by Magpul Dynamics about thier version of it.
http://www.youtube.com/watch?v=Moas5mUD9yA
I do not recommend alot of Carbine classes but if you do your homework on Magpul Dynamics and the bios on the two gentlemen running it t really makes sense to take one of thier classes. Plus thier DVD series I and II on the tactical Carbine is worth getting not only for training but its really good "Armour Porn" to watch.
Anyways, Good talking to a fellow gun guy and have fun in the build. Its some good alone time.