Sweetwater has some Roland and Peavy stuff on sale at the moment. There is not a lot of difference in price. I have worked on both brands in the past. Roland seems to be well liked by many keyboard players.
I have had a couple of Roland amps in the past and liked them.

How they sound from one brand to the other is mostly related to the speaker in the amp. Most all of the brands will sound better with a 15 inch speaker. In general it is better to have a bigger amp and turn it down than a smaller amp and turn it up.

Reverb sell a lot of good used gear. Sometimes a real deal can be had. 370 Results for "roland keyboard amps" on Reverb.com

Good luck Matt

Billy

“Amazing! I’ll be working with Jaco Pastorius, Charlie Parker, Art Tatum, and Buddy Rich, and you’re telling me it’s not that great of a gig?
“Well…” Saint Peter, hesitated, “God’s got this girlfriend who thinks she can sing…”