adeep42,
I own the Kit 1, but I had it built for me. I have read on the forums though that support for builders is very good, and when I have called Brian with questions he has always been quick to respond. The assembly manuals have also been improved over the years. One post above remarks on the high price of the kits, but the material quality is very high, and the sound quality is fantastic. I actually consider them a great value. I have heard of the Bottlehead of course, but have no experience with it.
The Kit 1 has been around for quite a while, and is considered a classic. If you are driving efficient speakers, I think that you would be delighted with it. They are good looking too.