Hello all. I've been lurking for quite a while and figured I'd better go ahead and get on here. I've been looking at all the AR options out there and am having a tough time deciding which route will serve me best. I don't think I'm ready to build from scratch just yet so figured buy complete or semi complete. Thoughts?

http://www.spikestactical.com/st-m4-16-le-carbine-w9-bar-p-804.html

Or

http://www.midwayusa.com/product/843983/yankee-hill-ar-15-specter-xl-black-diamond-upper-receiver-assembly-556x45mm-nato-16-barrel
And
http://www.impactguns.com/spikes-tactical-ar15-complete-lower-receiver-w6-position-stock-colored-bullet-markings-stls011.aspx

I'm also built my first AR last year and decided on building my own Lower, then purchased a complete upper from BCM.  I highly recommend this route as the lower is easy to assemble, and buying the upper complete from BCM means plug & play with the lower, and no worries about head spacing.  Iif you do it this way, you will save quite a bit of $$, and can focus on buying a nice optic & accessories.

I second this idea ^

Build a lower and buy a BCM upper of your choice. I recommend the KMR rail.