i juz bought a laptop, asus n56..now looking for ssd to install at caddy bay
which ssd is worth getting? for 120gb/128gb

Seriously? Adding a SSD through a caddy will void the notebook warranty? 

There'll be a price drop for the 330 next month to bring it down in price with the M4.
So get whichever that you can.

330 is SF-2282 based.
Use a hairdryer to heat up the glue so you can peel the sticker off.
Heat it back later and stick it back in the same place after done with the upgrades, problem solved.

What warranty void?

i did ask Acer Highpoint (LYP service centre) before regards to upgrading ram/hdd/ssd & they told me that it wont void d warranty & purpose of d sticker at bottom (screwholes) is meant for costumer to chk at point of sales whether or not d laptop hv been tampered or not.

How much bro?

Your friends are misleading you, there is no such counter for SSDs. There is only the wear rate of the SSD which is actually a lot and shutting down often won't do it any harm. With proper settings in order, the wear of the SSD can and will be reduced significantly and you could expect 5 year or more lifespan if you don't get a lemon.

You're actually right, moving the contents of hibernated state should in fact kill it faster, even more so if you have a lot of things opened and loaded into the RAM. With SSDs as fast as they are now, not much of a difference between hibernated or shutdown but I prefer shutdown more as it gives Windows a fresh start every time.
Put the sticker on your car bumper, see if it makes it go faster.

Gosh! This is really butt hurt. I just bought my Crucial M4 1 week ago. Duh...

no need partition.... trust me, you wouldn't want a partition on a disk with small capacity...