I’ve got one of the Marin Alp bikes, a Lucas Valley. Basically it’s a flat bar road bike, but according to the marketing BS it has mountain bike angles. Not sure how true this is, since I’ve only ever ridden a road bike once. I would say it has a nice upright position though, which works for me. I reckon it’s about 30% faster than the full suss on my commute. Mine was £650, but you should be able to pick up a lower spec model from somewhere like cycles uk if you can still get an 08 model.
Have to say I love mine, it just demands to be ridden quickly. Always get to work beaming and sweaty 🙂 Specialized do the Sirrus, which looks similar and has some cheaper models