i never wiped anything if going for same rom.  but as usual, i backed up all apps using TB first, backup sms and call logs and then nandroid. if it goes wrong, directly wiped and install the new one, no need restore~~
i called senQ first and they said dont know when the order stock will come. then i go to samsung center, the banner was like "Hot Selling SGS2" and stuff, i went inside and woo yay got one cuz got dummy there. i asked and same answer as SenQ. i was about to buy from this forum, but need to wait for postage(which i cant wait anymore!), then on the way exiting the kbmall, my mum wanted to go inside pacific, i went to the phone shop that is near the lift, saw ipads, galaxy tabs, iphones, then went to back of the corner, got SGS2. I asked, and they said many SME stocks! i straight away agreed and got it at 2039!

sorry for telling my story, but i havent been able to tell anyone yet haha~~

if i were you i cant wait lol~~ if its SME set then its ok confirm you'll get 1 year warranty from samsung and they will tell you if want to claim warranty go to the depan istana lama, dont go to them anymore. if its AP yes maybe should be afraid. the shop i bought my sgs2, their AP set only 1 month warranty. wtf. lucky got SME one.