If you’re looking at Hope then take a look at Rush Cycles. They have some decent bundles. Stay away from the braided hoses and floating rotors and all is well 😉
Personally I’m running Guide RS’s on main bike and M675 SLX and M785 XT on another two. I’ve got a second set of Guide RS’s, the only thing really stopping me fitting them is that the SLX bike has a Shimano drivetrain and it’s all neatly iSpec’d up. The XT bike probably isn’t staying around long so I’m trying to leave it as is. Of the two, I reckon the SLX brakes are better/less faff than the XT, and I prefer the Guides over the pair of them by a country mile, for the reasons Joebristol quotes. It’s like trying to compare Zee or Saint brakes with regular Shimano, but with foolish amounts of modulation on top.
No-one ever really regretted Hope brakes so long as they could afford them and they could see past the fugly levers. Guides have basically exorcised the ghost of Avid past apart from odd hardcore holdouts. Shimano aren’t as on/off as they used to be but they’re definitely still a more positive feeling lever than SRAM, but with far less subtlety. Buy whichever you prefer the lever feel of, but do make sure you keep the receipt for the Shimano. I take Kayak’s point about volumes, but the Shimano leaky caliper seals story is starting to get to the levels of Reverbs for how often you hear failure stories.