to tell the truth, i was snooping around and i found a z68 itx board (asrock iirc), but I confirm i don't plan to overlock; instead, one use of the z68/k combination could be to downclock the processor more freely - if necessary to obtain a truly quiet system (was thinking about undervolting a little bit, like spcr did when reviewing the 2400 vs 2400s)
thanks again for all the tips!
While I know the 2500K is really popular (I mean, I have one...) I don't believe the Z/K combination is necessary to underclock, just overclock. Further, if you're going to underclock, you can get the same effect, essentially, by using one of the LV chips or just a slower option (like the 2300, since you didn't mention gaming I doubt you have a need for the HD3000 graphics). Can you get the 2400S, 2405S or 2500T where you are? They're about the same price as the 2500K, but under-clocked out of the box. Might just be a simpler way to get the same effect, and you could then certainly go with a cheaper H61/H67. If not, I'd assume you could get the 2300. As a bonus, those chips would have virtualization and some other toys available that are disabled on the K.