Hay mate i own a s2.
Prices for them have fallen a little over the year.
I beleive 20k mark for a stock one is alittle to high. Maybe around 18k if its in really good condition. Only you can judge if its in good condition since we cant inspect it, nor see any pics. But pics can hide many things..
Anyways to maintain its costing me about 100bucks for servicing every 5000kms.
But thats with really good quailty oil etc etc..
Other than that, i have had no problems with my car whatso ever.
once you start modifying it, just make you do get quailty parts.
but seriously if your car is in good condition and service it every 5000kms, you shouldnt have a problem at all.. Unless you thrash it lol..
Gdluck n maybe post up some pics.
Hope its SILVER!!! lol