I love my Marshall Mini Silver Jubilee with the matching 2x12 vertical cabinet. There are better sounding amps out there by themselves, but it sounds damn good at gigs as it cuts through a mix real well. I'm real happy with it.
The Splawn SS is a great amp, but there are cheaper mini heads out there.
The 5150 lunchbox is a mean sounding amp! I was impressed with it.
From the comments the 6205 sounds like it may be the best bang for your buck mini. The Jet City is too, as you can find them used for around $200. I had one and I sold it when I got the Jube. Its a great amp that comes with bad tubes. I changed the preamp tubes and it sounded much better.