Well, here's my two cents worth, coming from someone who's played through tube amplifiers of all sorts over 30 years, in a few punk bands over the years.
You want point-to-point wiring. Not because it makes any difference in the sound, not because it looks cool when you take the amp apart, but because you can repair it if it breaks. This may not seem important now, but you may someday be getting ready to play and find that your amp is not working. If you have a circuit board in it, it's difficult to repair quickly, sometimes impossible to repair at all, but point-to-point will be pretty straightforward for anyone who has electronic chops to work with.
You want tubes, not because they sound "warm" or "analog", but because they can be replaced, overdrive better and don't burn up doing so, and build up your arms from carrying your amp around so you can someday look like Henry Rollins.
You want an amp with less than 50 watts, and probably less than 25 unless you plan on playing the Superbowl without miking up. If all of your distortion comes from boxes, and you play death metal, you may disregard this advice, but if you want a good sounding distortion out of a tube amp, turn the thing up past halfway and overdrive your power tubes. You'll like what happens.
Finally, if you really want to sound good, consider the whole system. Humbuckers in your guitar or single-coils? Distortion box or overdrive, or nothing at all? Do you use delay? Chorus? Each of these choices make certain amps better than others, although a great amp will sound good with just about anything run into it. Closed back cabinets will make you have a midrange "knock", open back combos will sound more natural, but no advice can take the place of your ears. Take what stuff you use, all of it, and try the amp out on a variety of settings. Annoy the salesmen at Guitar Center, and fiddle about with everything they have in the shop, even stuff you can't afford, to get an idea of what works for you. You might find that you like little steel guitar amps from the 50s, or you might find that only a Gibson is good enough...or you may discover that a triple rec is the only way you'll be happy.
Hope this is useful to you, guy. Have fun playing!