I would highly recommend a solid state amp like a Roland JC-120 or a Fender Princeton Chorus. They are inexpensive (and transportable) jangle machines. My FPC shines with both my Ric 12-strings, not to mention my Strat, my PRS, and my Guild X-170 hollowbody. The Princeton Chorus is no longer made, but you can get a used one for next to nothing (probably in the $100-150 range). If you're a tube snob (as are many here), I would recommend either a '65 Fender Deluxe Reverb Reissue or a Vox AC15. (Gary at North Coast Music will replace the Celestion Greenback speaker with an Alnico Blue, for a modest fee, if you choose). The Vox is cheaper, but the Fender is more versatile and much lighter to carry!
Plus the spring reverb on the DR runs circles around the reverb on the Vox. Ideally you'll want to audition all of the amps you're considering, with new Ric in hand. Congratulations on the purchase, by the way. I hope you get years of pleasure out of that beauty!
