Help choosing a good performing eSATA pc express card for MBP

Hope someone here can help me with a new purchase :-) I currently own a macBookPro 17" (brought almost 3years ago). I wish to get a pc express card for it to connect an external esata hard drive (most likely raid0 type as I do video work). I have seen and read about sonnet cards, and also noticed lacie sell a card. What are the recommendations here from users for a card that will give me good perfromance, I would rather pay more now than suffer slower speeds later.

So I have seen this one http://www.macupgrades.co.uk/store/product_info.php?products_id=373 , and
http://www.lacie.com/uk/products/product.htm?pid=11033

I am not really sure what I need to be looking at with regards to specs. I am not really interested in daisy chaining more than one drive per port, I think doing so will slow my bandwidth.

All suggestions welcome, and if you think posting to a different forumn category will help please also let me know (the hardware one I spotted was for windows :( )

Thanks in advance
-Chris

PS. Basic specs from my machine if these are of use to anyone.

Model Name: MacBook Pro 17"
Model Identifier: MacBookPro1,2
Processor Name: Intel Core Duo
Processor Speed: 2.16 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 2 MB
Memory: 2 GB
Bus Speed: 667 MHz
Boot ROM Version: MBP12.0061.B03
SMC Version (system): 1.5f10

Regards
Chris Forrester
demoreel www.chrisforrester.tv