Firewire 800 or eSATA External Enclosure for Time Machine

I am stuck trying to decide which external enclosure interface I should go with to backup my MacBook Pro Core 2 Duo (Santa Rosa) using Time Machine. I’ve narrowed it down between Firewire 800 and eSATA. I know that you can’t boot off eSATA like you can with Firewire, but I don’t need that option since Time Machine doesn’t support a bootable backup. I also know that “theoretically” eSATA is faster than Firewire 800 since there’s no encapsulation. I am only using about 50GB out of my 120GB internal hard drive.

Here are my options:

Fantom GF500Q 500GB Quad interface (USB, Firewire 400, Firewire 800, and eSATA)
Price $150

Fantom G-Force GF500EU 500GB USB and eSATA
Price $105
Rosewill ExpressCard/34 Card
Price $20