Hi Jim,
Don't forget the Green hotwheels (200) with a checkered roof also came with a hotwheels collectors decal on the side, and in a version with 'lace' wheels.
The blue (158) hotwheels with checkered roof also came with lace wheels.
Expect to pay $10 to $15 each.
Then there is the chrome hotwheels, two versions, one on a 'super chromes' card, with american flag based decals, one loose that came in a USA target 10 pack in 2007 with 'Cr' decals.
There are two 'treasure hunt' minis from hotwheels too;
The first came in 2002, and is black, very nice (expect to pay $20 ish)
The second was ultra rare in 2005, USA only release yellow with striped roof (expect to pay $100 ish)
There was also a silver hotwheels released in a 5 pack, with tiger decals,
Also came in Orange with tiger decals in the USA.
Then there was the bright orange hotwheels in a 'power launcher' set.
With the matchbox van there are a few more;
The purple van in the 'plastic' box came with two wheel versions
There are two "Best of British" released vans (limited to 9000) one is a drab olive (2008)
the second is a cornflower blue butcher's van (2009).
There is also a 10 pack (all exclusive, USA UK release only, VHTF) with a pearl white "pizza" van.
And a Gold coloured van only one with a white base, which came out in a 10 pack in 2007, USA only.
Oh, the Blue van has two wheel variations too.
Then there are some promotional Matchbox Vans,
Metallic blue Matchbox Collector's official release (250 released by matchbox)
Dark Green UK Matchbox collector's (400 released by matchbox)
A promotional Matchbox sedan came out about 5 weeks ago, 250 released from the factory, metallic green, custom 50th decals, very nice.
The red sedan has just been replaced with a dark green sedan in the USA so we should see it in a few months!
I'll try and dig some photos out for you! {edit some pics added, just what i had}
Matt