Budget Tower

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http://crunchbang.org – Since it looks like you might be going the dedicated graphics care route I've found AMD processors and nVidia graphics cards a good match. Sometimes really good deals show up on the graphics cards. As far as cases with room to grow, I'm fond of NZXT (I have two Gammas, whch I really like). The design is a bit "different" (honeycombed for air flow) but easy to work with and plenty of room for hard drives. They go on sale a lot (mine were about $20 USD each). If you like horizontal cases, HEC makes a decent one (but it's a bit dated and you'll have to add a front US (HowTos)