I here a lot of talk about linode, but they are hardly the only competitor. I'm a very happy customer of ARP Networks http://www.arpnetworks.com/vps . They support FreeBSD and OpenBSD in addition to Linux and have competitive pricing. I run 4 low traffic sites (2 rails, 1 sinatra, 1 django) on a $10 VPS without issue (using nginx, thin and tornado).
They are probably the best option if you are going to run openbsd or freebsd on a vps, though if you are going for linux I would say my experience with prgmr (for a similar price range) was much better than arpnetworks and if you want support/dns you should go with linode.
