For Jazz, you can fold the back seats for a unbeatable boot
space. Easily 2 mountain bikes without the need to take out the
front wheel. Anyway, you are driving a hatch now, so it should be
about the same. Or if you don't mind, you can try City, the boots
space is definitely the biggest of all the cars I see so far,
unless you are talking about lorry. Bottom line for me is, if you
have the budget, go for Honda, Honda's engine have had the best
ratings in term of fuel comsumption.
As for the interest thing, you might want to check with your loan
agent or the SE who sell you matrix. They can give the the extra
information. Now there are some matrix on sale at the sgcarmart web
site, might want to take a look to monitor the reponse of buyers
there. Like how long it takes to sell off 1 matrix.
From feedback here and there, you will be having a really hard time
selling off your matrix, too much hard comments about it.