Personally, i would not buy any tube amp with dsp effects...for me it takes away that organic tube edge that I love so much.

A 25wtt tube amp is perfectly good for any club gig with a house pa system...a 15wt is probably a bit weak...but I reckon you could manage.

at the end of the day, this stuff all boils down to personal preference(as does pretty much everything guitar-wise, above a certain level) try out various amps and see what you like...the vast majority of players who can afford to play tube amps do, but thats not to say that some dont...even some famous guys like the Late Chuck Shulinder of Death (played Marshall valvestate) and the sadly missed Dimebag (famous for his solid-state Randalls) preferred solid state transistor technology to tube...you gotta try it all to see man...