Thanks for posting the pics and info.
Your red NV200 van looks good. The new wheels and tires are infinitely better than the crap OEM tires and lame steel wheels.
Those Continental Vanco tires have only recently been released and meet the OEM load and pressure ratings for the van.
One can see a much better all-season tire pattern with siping.
However, they still look small and Continental does not offer a slightly larger size tire in 15".
IMO, even a 195/60R15 would be better in terms of performance and looks on your new wheels. However there are no tires available in that size that meet the OEM tire load ratings.
As I've posted in other threads, there is the All-weather Nokian tires in 205/60R15 with adequate load and pressure rating.
http://www.nokiantires.com/tire-selector/summer-tires/results/205/60/15/
I think these slightly wider and slightly taller tires would look great on your new black aluminum wheels.
These tires would not be as good as the Continental Vanco's in the summer but superior in the winter. The wider width would make for much better handling and wheel protection.
The Vanco's are an all-season tire and would not be adequate in snow and ice.
I'll be testing these tires on the OEM 15 x 5.5" wheels shortly.