integrated for zu definition 3

I just got these new def3 speakers and currently have a viva 300p, but want something with a 845 tube but stll very musical and involving.

I know I may not be able to get into the 845 with my budget which, I think I have the viva sold for $2500,and I can add another $1000 so $3500 total.

I know these speakers have the capability of being keepers for life I just need the right amplification.

thanks,Scott