[Steve DeRosa]

I'll take that '65 Princeton Reverb and - with the emphasis on "portable" - raise you (in ascending price order):

• Bugera V5: more tone than anything this inexpensive ($199 street price, far less on Coupon/Holiday Sale days) has the right to have - flip the money you save into a set of primo tubes, go toe-to-toe with the big-buck mini-amps, and hit 'em right in the ego where it hurts
• Tech 21 Trademark 30: still available as NOS, a bit pricey for a 1x10" solid-state 30-watter but if you need gigworthy tone/small-hall volume in the lightest (14 lbs.) possible package the original is still the best IME
• Vox AC10: Let's face it, most of us don't need an AC30, and considering the AGF demographic even the 50-pound AC15 isn't exactly "portable" any more; far louder than its nominal 10-watt rating might lead you to believe, easy on the back at 27 pounds, and if you own one of the new-generation Gretsch Electromatics you'll be hard-pressed to find a better match in a combo amp
• Egnater Tweaker: Want a low-power tube amp but can't decide between American or British tones - not to worry, this one lets you mix-and-match to find your signature sound, with a minimum of controls and none of the complexity (or IMO soullessness) of modeling amps
• Roland JC-40: If you like your tone crystal-clear and clean the Roland JC amps have long been the Holy Grail - this one delivers most of the mojo of its JC-120 big brother at about half the weight (the JC-22 sounds thin by comparison, especially with single-coils), and if you're running a well-stocked pedal board I can't think of a better platform for small-/medium-size venues
• Quilter Labs MicroPro: The "killer chihuahua" of the guitar-amp world, full-stack power in a 19-pound all-analog solid-state package with a full complement of features - not exactly cheap at ~$1K street but competitive with the boutique solid-state jazz amps from Henriksen, Evans, et al., and far more versatile in its potential applications