I'd consider going with a tesseract modular tex-mix (reasonably priced and expandable) instead of the cosmix - and some blind panels - and put the money you save towards the next case - then there's no issue with only having a few hp to fill... you'll have lots of space, so can get whatever modules you want no matter the size... at least for a while!
-- JimHowell1970
Nice, you reminded me of the Tex-Mix, thanks, I had that on a list from Mod Wiggler, but had forgotten. As for the idea of leaving the rest empty, I'll definitely think about that, although to a certain extent I'm hoping to be portable (not too big/many cases).
Just for the info, I have an empty (if you can believe it) 104hp case - with power supply etc - which was the first case I bought and built/filled.