Seriously, take a look at a Pod Go - Helix amp models in a small, affordable package. You could easily get one and a FRFR speaker to run it through well under your budget, and it'd give you a really good handle on how different amps sound and respond. Modeling has come a long way - I've been a tube snob for years but the current generation has converted me. Pod Go is $450 new, and something like the Headrush FRFR 108 to run it through is another $200 or so, and you can then really experiment with amps and effects to figure out which sounds work best for you. I have both the Pod Go and a Helix LT, and sold all of my tube amps and pedals...you may end up going the other direction, but for someone who is still learning and experimenting, you can't beat the Pod Go.