Back before the Net, I build my first Jeep with 90% Leon Rosser stuff... but they closed by the time I started my TJ.
Now I just search for the needed item. I have had good luck with the big boys (Q-tec, 4WD) and lots of others such as RE, DPGOFFROAD, Clayton offroad and others.
Whatever you want just spend the time to do your research and you will be suprised to find the deals that are out there. Sometimes it is cheaper to buy direct from the factory because the shipping is less than the sales tax, some times a certain place has a deal that is better than the factory. As an example I bought a set of Yukon rear axles from Groupbuy 4x4. They were dropped shipped to me from Randy's ring and pinion for about $80.00 less than if I had driven up to Randy's and picked them up. Bought another set of Superior axles from Summit Racing, shipped straight from Superior to my door for $100.00 less than had I gone through Superior. HOMEWORK PAYs!!!
We have build many rigs for our club members and 4WheelingPlus.com is where we end up buying parts from over and over since no one can bet their prices. I have bought three Rough Country lifts and three Mile Marker winches from there just for my own rigs. I am look to buy another lift soon as I figure out what brand I want to buy for my CJ5. So far 4WheelingPlus.com is cheaper than all the other places I have looked for the different brands.