Simon,
The base Pontiac Solstice has a 177HP inline 4-cylinder engine, and has an optional 260HP Turbo model that really scoots.
My wife & I bought a 2007 model in 2006 for just under $27K, had all the options except the Turbo (damn)! Just turned 4K miles the other day. Really fun to drive, responsive, and for only 177HP, pretty peppy too! Every time we drive it, someone walks up and asks us what it is? We get alot of thumbs up. Fun car to drive with the top down.