First, disk brakes are not necessary IMO unless you descend big hills/mountains or carry loads.
I started out with a set of Tektro Aquilla's. They are awful. Always rubbed.
I then went to the Avid BB7's. I went with a 185mm rotor up front and a 160 in the back. The 185 front brake has a noticable increase in power over the 160 Tektro I had up there originally. They are really nice brakes and once adjusted properly, work well and do not rub.
Personally, Juicy's are way more hassle than necessary. I recommend the BB7's.
Watch greenfishsports. They run BB7s in the low $40 range each now and again along with free shipping over $60 or so.
Last edited by jsmithy; 09-24-09 at 06:01 AM.