im confused.....
getz
-much older..... and much cheaper
-not exactly a cheap and cheerful car. Cheap to buy, not very cheap to maintain

i10
-to me this is like a getz replacement
-not sure about maintanance dont think it will be that cheap, (cost price to maintanance ratio ofc)

axia
-wait what... new for 20k or less ??!!
-cheaper to maintain (im sure) than the 2 above
-better mileage than the 2 above
-im also sure its out of your budget

satria neo
-simple no problems
-makan minyak je

your budget seems abit.... welll looks like its not really 20k....
(am not sure bout this, but i thought perodua sells their cars on loans~~ u mau bayar cash also they duwan to accept  , that is what happened to my aunt 3-4 yrs back, she went all over the place but all wanted to sell WITH a loan...)

a neo for 20k would be an older NON-cps model.. if you can afford it, get a newer, more fun (manual for alot lot more fun) cps unit (around 25-30k from a dealer, pretty sure you can get a decent unit for 25 or so from an owner)
note that, the neo is more of a 'performance' oriented car. It is NOT frugal. It is also an older car so dont find an abused/modified unit if you do go this route.

there is also zenix's favorite goto latio which will do the job. reliable, reasonable maintanance, cheap to buy.