Newbie here; had a question or two

Hey guys, this is my first time checking out AVADirect, and had a question or two. Firstly, I am not in the market just yet to buy, just doing some research and figuring out what's best for my needs. If I have a custom build in mind, is there somewhere I can post it to have you savvy people check my components to make sure they will all jive? Also to offer suggestions on what the build could use or do without? And finally, for now, what makes AVA stand out above other sites like iBuyPower or TigerDirect? Thanks for your time, guys!