Currently there are some other options for hosting your "virtual" FreeBSD server. Some good ones are RootBSD [2] (US), Brightbox [3] (UK) and TransIP [4] (NL). Quality wise that are equally good. I'm currently using TransIP because I'm located in the Netherlands.
Interesting to note is that the above providers make use of KVM virtualization technology. Phoronix did an interesting benchmark comparing Xen, Virtualbox and KVM. It showed that KVM was the winner on compute and disk performance [5]. Would be interesting to find out how FreeBSD performance on Amazon's XEN layer.
[1] https://www.wunki.org/ [2] https://www.rootbsd.net/ [3] http://brightbox.com/ [4] https://www.transip.nl/ [5] http://www.phoronix.com/scan.php?page=article&item=ubunt...