I'm a huge Crucial fan - I have a 512GB Crucial m4 SSD series installed right now and am eagerly awaiting the shipment of the Crucial M500 960GB SSD. One thing that I love about Crucial is that you can accomplish firmware updates directly on your Mac - with Samsung, I believe, you have to use a Windows machine.
Crucial SSDs are perfect for Macs - many of us around here have them.
The only problem that I see that you may run into is getting the data from your hard drive (you don't say how much space you're using on it) to a 128GB SSD. If you're under 128GB on your HD then you can just clone your data and OS, etc., onto the new SSD. Or you can make a 'fresh' start and format the drive and install the OS and then begin the laborious task of adding your apps back.
See my one and only user tip - Upgrading your MacBook Pro with a Solid State Drive - for some tips on transferring that data. I've always used Carbon Copy Cloner - but then I've always been moving to a SSD that was comparable in space to my 'old' HD.
Call back with any questions...
Clinton