A few more ideas are
Creek 4330se(40 watts dynamic and punchy amp, great value)
Rega Brio(30watts entry level, punchy and smooth sounding)
Sugden A21(25 pure class A watts, very sweet sounding)
Exposure 2010s(new entry level integrated, 100watts)
Naim Nait 5(30 watts, very lively, punchy, dynamic, sweet..)
Jolida 102b(20watts smooth tube sound, great price)
if you dont mind used you could look for an
Exposure XV(40watts, awesome rythm and timing, sweet mids)
Naim Nait 3(30watts, king of rythm and timing, bit bright)
Audio Analogue Puccini(50watts very tube like sound)
You cant go wrong with any of these amps, but if you want a punchy dynamic sound definitly check out Exposure, Naim, and Creek. They all have the classic british sound, excellent rythm, timing and dynamics with a sweet midrange and treble. I personaly use an Exposure XV with my RF-3's and it is an excellent match, just something about it that sounds very natural and right, really excellent with rock, blues and jazz.