Faster than my firewire (so glad I picked up an extra sandisk firewire 800 reader a few years ago!) is the sonnet TB adapter with a double PCI compact flash reader but I think they may be discontinued also. http://www.sonnettech.com/product/qiothunderbolt.html
when I had the FW700 version it cost me $60 and the throughput was somewhat better then the FW400. FW in general fell well short of its promised superiority except in certain applications that were more controlled and eliminated those poorly designed consumer plugs.
If Intel had supported USB 3.0 earlier instead of messing about with Light Peak, we would have had the former much sooner and FW would have died out in the consumer space even earlier.
The only two FW800 CF readers I've encountered in the wild are the Sandisk Extreme Firewire 800/400 (which I own and have enjoyed using for the past several years, despite encountering a bent pin...one of the hazards of CF technology), and the Lexar Professional UDMA FireWire 800 both of which, I believe, are out of production. I have seen both of these pop up sporadically on the B&S board and they can be hunted down with some small effort online. The Sandisk, if I'm recalling correctly, went for about $59 new, though I may have gotten it on sale at some point. I've seen used prices range from $40 (a recent B&S sale) to nearly $100 for that reader.
As for USB 3 on that MBP, if yours is a 2012-or-later model (e.g. MBP 9,1 or 9,2 or later), you should be good to go. (You can check the model version in your System Profiler application, Apple Menu>About This Mac>More Info...) I haven't gone USB 3 as of yet, so that Lexar Reader that EB-1 recommended might be the way to go for you.
However, if you're bent on going with FW over USB 3 I wouldn't sweat the speed differences between the two, judging from the test numbers I've seen the few seconds difference in real-life usage would be meaningless to me. This is all covered ad nauseum with a slew of cards and 25 different readers over at Rob Galbraith's site...
...the page hasn't been updated since 2011 (so, no 1000x cards tested) but you'll get the gist of what I'm saying from his test results. FWIW, he mentions a few other FW800 readers there, as well.
Anyhoo, I hope this was helpful! Let us know what you decide...
