If you want a center console, get the OEM JDM version. On sale now at ICB for 199.97, used to retail for around 330.
JDM GD3 Fit Armrest Console Kit w/ Adjustable Armrest - IN STOCK!
I have it installed on my car and think it's a great upgrade.
As for getting 15 inch rims, I would try to look for a used set of OEM Honda Fit rims for the sport. When people buy aftermarket wheels, they often sell them in the classified section of this forum. That will be the cheapest option. Of course there are a lot of aftermarket options as well.