I'm very happy with my Pocketbook Touch (http://www.pocketbook-int.com/us/products/pocketbook-touch). It seems quite hackable, the vendor is responsive (some employees hang out on www.mobileread.com pretty regularly). The touchscreen works well and the buttons for paging are great.

I've bought one or two books off Amazon and used de De-DRM tools available to put them on there, though it even supports the Adobe DRM (not Amazon's, though). It does have some annoyances but I haven't hit any major snags in several months of use.