having owned a few (shimano x2, avid x2, hayes x3, formula x2, hope x2) i would say overall id go for hopes. they are not the lightest, not the cheapest and (IMO) not the prettiest but they ARE reliable, powerful and also importantly they are not modular units so you can replace the tiniest little parts, no matter how obscure. their customer service is second to none and ive never heard of them quibbling with warranty etc.
after learning several times over how hard it can be to get replacement parts for brakes and never successfully getting anything replaced on warranty despite a good case for it, ill be sticking with hope from now on…