Thanks for the welcome! That's the fun part - working out the target budget and age.
Looks like I could get an private sale 330ci from around the year 2000, with over 100,000kms for under $20k. One advertised for $19,000 just got re-listed on TradeMe today with 1 dollar reserve. I will watch that one with interest.
On the other hand, there are some nice Motorsport models, newer, with lower kms, up around the $25k mark or more. I am enjoying trying to workout the market for these by watching which ones get sold or relisted. I might post some links in the TradeMe discussion section sometime to discuss individual cars with anyone who is interested in them.