Re: best 5-15 watt tubies
As a student, I feel your pain for the small valve amps. I've used or owned all the amps discussed - and for me, I settled on a Crate V1512T . . . the one that has the Tone Tubby speaker in it. The only restriction is that it may be a bit more pricey than some of the little amps discussed already. The blues junior is nice in its place, but I find them to (stock) be a hair noisy. Still, if that's the tone you want, it is sweet - as are the Epi's.
Without trying to be blasphemous here though, if you haven't already - try Tech 21 amps. They sound quite good, and are very flexible. The response isn't quite the same as tube, but if you're on a real tight budget it's not bad at all.