Driving a power amp with an integrated amp?

Is it NOT recommended to use an integrated amp with a power amp? Somewhere in the forum I read that it is not a good thing for the integrated amp?? I have a NAK IA-1Z/Kef 104.2 and am looking to transition to separates without spending too much $$ at once. My plan is to purchase a 2 channel power amp now (under $2,000.00) and use the NAK to drive it until I can replace the NAK with a preamp somewhere down the road. I am looking at some NAD, Adcom, Rotel as well as some low end Krell. Any thoughts to this approach as well as the choice for power amp is appreciated.