preparing for new canon lenses!

i went to break fast with the photography club a couple of days ago. i was kinda jealous when a few of them started to take out the DSLR cameras with huge lenses. extra flash also. it made me want one. mine is only EFS 18-55mm. so when i got back to the hostel, i browsed the net for affordable lenses. i found one shop at Penang KOMTAR called colors & colors. now, i have three choices in mind. the prices are damn affordable and cheaper than the actual price. these are my choices :

1) EF 70-300mm f/4-5.6 IS USM

my friend bought this one for RM800 smthg while the actual price almost reached RM4000

2) EF 55-200mm f/4.5-5.6 II USM

found this one for RM590. dunno the actual price but compatible with my 500D even though it's an EF lens. but i dont see any IS. huuhh

3) EF S 55-250mm f/4-5.6 IS

this one is RM 800 smhtg also.

out of the three,i prefer the first one and the last one. but i'm only gonna pick one. and i need experts help!!