the SPS-17C2 is the newer version(2006 model) of the SPS-170A. Slightly different in terms of tweeter material, the 170A is metal dome tweeter and the 17C2 is a silk dome. Haven't auditioned the 17C2 but preliminary thoughts of it is that it might not sound as open as the 170A as silk domes need a bit more power to be driven than metal domes, that is of course, in my opinion, don't ask me for proof or what la...
Hm... khangwee, am not too sure if RM300 is a good price for it, but maybe try getting quotes around from a few shops first and see about it? ;) Make sure the set is a Woo Kee Hong(WKH) set, look for the WKH sticker on the speakers. There's just too many fakies around nowadays so it's worth it to be careful.