I'd avoid the polo 6n, the word chocolate components comes to mind in my ownership of two of them. Always a gearbox issue somewhere along the way and TB issues (but thats common for vag), apart from that they are ok, easy to repair and maintain, but my mk4 1.8T has cost me miles less in maintenance than my polo's. My polo's bills where so high I could of bought a new LCR 
KA's rust like mad, I'd look at a micra personally
Agree fully about the Polo 6n. I had the 1.4 16v model and even though I really enjoyed driving it, very nippy , great handling ect, the bills on fixing bits here and there were out of hand. Had a new clutch, gearbox (luckily managed to get it for free due to a old recall issued) and just little issues that seemed to happy every other week.
Only had it 12 months or so before some silly girl decided to crash in to me , writing it off, but it cost more in bills in those 12 months than MK4 1.8T has in the same time
Completely agree, I had the 1.0MPI and then the 1.4... both gearbox issues like mad, I remember waking up one morning and putting it on reverse only to nearly go through the house in front, the reverse gear failed and in turn would only go forward :embarassed: What the 1.8T has cost me is nothing in comparison to what the 6n has cost me, its utterly crazy when people go on about how smaller cars are better, economical, cost effective, more reliable, easy to fix etc...
Yet I abuse the 1.8T non stop from cold an it keeps going, the 6n driven normally just fell apart
I know a few lad's on here that would say avoid the 6n like an STD.
