Preamp/ Amp matching

I need some advice on matching a preamplifier to my existing tube amp. The amp is an Audio Research D250 with single ended inputs only. I am concerned that a more modern preamp would be a waste because of the balanced circuitry involved as opposed to a preamp built around the same time as the amp which only has SE outputs. Budget at this time is of MAJOR importance and leaves me with few choices as I would also like a remote. I am currently looking at the following models.
ARC LS-9
VTL 2.5
ARC SP9MKIII
Quicksilver
Suggestions?