Which SSD for my SATA II?

I want to upgrade my MacBook Pro's 5400 rpm HDD to an SSD. There's no point going with a SATA II since those are about the same price as a SATA III and if I got a SATA III SSD I could use it on whatever new computer I get later on. So I've got a choice between the following:

Intel 330 - http://www.canadacomputers.com/product_info.php?cPath=179_1088&item_id=047838

Sandisk Extreme - http://www.canadacomputers.com/product_info.php?cPath=1088&item_id=047585

Crucial M4 - http://www.canadacomputers.com/product_info.php?cPath=1088&item_id=039183

If you recommend the Sandisk or Crucial, are they worth the extra $10? I'm already pushing my budget with one of these.

I've heard good things about the Intel drives and they're listed as faster.