Skoda Roomster - now or later

Thinking of downsizing (current car AU2 sedan) - but I want a wogon with 
plenty of space.

Skoda Roomster fits the bill. Good safety, stability control, diesel
engine, 
manual transmission.

Just some concerns.

Is $28,990 (for the diesel) a whacked price for a small car??? While there

are no competitors that offer its space for a car of its size, will it
lose 
out big time on resale when you can get other small cars for under 20
grand.

Also with the new Citroen Berlingo multispace to be released next year
(and 
available in Oz), is it likely to lose value? With the current Berlingo 
petrol 2 seater for $16490, how much can we expect the Berlingo multispace

diesel to sell for? ($25grand perhaps).

Should I wait a year - or just upgrade?