For solid state, the Tech 21 Tradmark 60 is a nice 60-watt, 1x12 guitar amp (they make a larger and smaller one as well). The guys in my band (www.BrassAttack.com
) use them and they really fit the bill.
Tech 21 is the company that manufacturs the Sans Amp tube amp emulation preamps. Good stuff.
Here is a link: http://www.tech21nyc.com/tm60.html
If you are interested in tube guitar amps, check out theTraynor YCV Series manufactured by Yorkville Sound.
The models are YCV40WR (available as 40 watt 1x12 or 2x10) and YCV20WR (class "A" amp 1x12). Yorkville also makes an 80 watt 4x10 and 80-watt 2x10. They sound great, are extremely reliable, and have a two-year UNLIMITED warranty (no kidding!) Their web site is http://www.yorkville.com/