M4 Crucial! 128GB.

I would go for Samsung.

IMO if you often dealing with compressible files, 330 will do.
else, M4 or 830 will do.

compressible files are like exe. bmp, etc where the file size can be decreased upon compression (ZIP,RAR,7zip,TAR) while incompressible files are files that doesn't shows much decrease in file size upon compression e.g mp3,jpg.

Here's what i've read from intel ssd 520:

if u're dealing most with incompressible files, then either m4 or 830 will do.
but if u compare the price between these 3, not much different actually.

ssd is somewhat like our flash drive, it will degrade as u use, so kinda hard to avoid it. not much to worry as long as ur warranty is still valid. personally i choose intel because i often deal with a lot of compressible files such as my VS2010 project, photoshop psd etc.

how about the warranty? because samsung is not sell ssd offically in malaysia

intel 330 will do.
went to lowyat plaza today for my 520 RMA, asked best price for 330 120gb @2nd floor, RM355. 

u know where to buy the odd caddy for hdd ,because i want to install ssd in my hdd slot and  move the hdd to odd slot

What SSD are you using? Have you udpated your firmware?
What it means is as what is written.
Sandforce controllers were never made with incompressible data to begin with, because back at the time NAND chips are still very expensive. Paying for a 128GB drive is already a luxury, 256GB or 512GB drives were just a dream for many. Storing videos on a 128GB drive is stupid, saving thousands of RAW pictures in .tiff format is ridiculous.

Because of that, Sandforce was designed to maximise speed on compressible data (which is why they are still the fastest in this sector), basically data such as Windows and most programs.

Back to your question, if you are going to be processing (and I mean processing like batch edits or resizing) a lot of images on the SSD then yes a drive based off other controllers (like the famous Marvell) is a better choice. But we're talking about thousands of pictures a day, unless you are a professional photo editor this isn't such a big point. HDDs are still fast enough.

The other instance is where you edit, encode and capture videos in real-time. Storing the videos on your SSD saves A LOT of time in comparison to a HDD. So much time that you can earn twice the amount of money you make if you're a video editor, I kidd of course but that's what I feel.
This question has been answered a million times in this thread alone... use the search function.