Upgrade for Thiel 1.6 - Or a waste of $$

Hi,

Currently using a Rotel RB-1080 with my CS 1.6. Although rated at 200w, it's not a true high-current (doubled at 4ohm) power amp.

I've located a pair of used Acurus 250 amps in town for $499 ea.

Would I get any tangible improvements by replacing the Rotel with the older Acurus 250 (and putting a little cash in my pocket)?

My budget isn't what it used to be (< $900) but I'd be happy to hear other amp ideas and suggestions. (No integrated amps, please)

Thanks,
--ksr