is there any particular brand of receiver or kit that one should purchase or are they all generally the same?
I lurked and asked questions on AR15.com and basically asked the same thing. If you are using "Mil-Spec" parts, then everything should come together. I really like the folks at J & T Distributing - I bought the base 20" HBAR rifle kit for $459 and had it UPS at my door step a few days later. Getting the stripped lower was a little more work being that it's the actual "firearm". I ended up driving to a dealer about 50 miles away who had a stripped lower in stock for a little more than a hundred bucks.
Following the instructions on AR15.com I assembled everything in an evening, in my basement workbench with only the most basic of tools. You could get by with a Leatherman tool if you had too.
Really fun experience so far. The accuracy, reliability and simplicity of the AR design fascinates me. It's really a clever bit of engineering! Oh and doid I mention it's a blast to shoot? We have a local private and a public state range here in Northern KY and I've already put about 300 rounds through this thing!
The endless amount of accessories for this thing is mind boggling too. Check out the folks at Magpul (
www.magpul.com) They make some great toys!