Well, there are 14 choices that have FW800 and eSATA at OWC and a couple more (mixed in with the eSATA+FireWire 400 ones) at newegg.com to get you started.
EDIT: I just reread your post and wanted to add that I checked a couple of them at OWC and both of the ones I looked at support the 3Gbits/sec throughout- but did not look at the specs on each so not all may.
Yes they have that- and a couple of the Mercury Elites are 300 all the way too-- but since you don't show a location, I didn't realize we were dealing with an international commerce situation. Sorry.