What's the vmod?
vMod is a system that is produced by Vizualogic. It's a rear seat infotainment system.
You can find out more about it here: http://www.streetdeck.com/node/46
If you want to buy the best hardware for StreetDeck to run on, in general, it would be an Infill or VMOD. This may not be the fastest or the cheapest solution, generally speaking, typical desktop hardware is both faster and cheaper then what is sold on MP3Car, but it sucks for use in cars because of the subtle issues like power management capabilities, size, ease of installation, and general temperature and mechanical robustness that are not easily measurable by automated programs.
In terms of just generic motherboards and processors (in other words the things that determine performance)
A VIA M10K is about the minimum specs you'll want to run StreetDeck on and is what I would call the minimum required specs.
A VIA SP13000 does a much better job and I would call the minimum recommended specs.
Anything Intel with a 915G graphics card or better should have no problem running anything and is significantly better then the Unichrome graphics processor in the SP13000.
I haven't seen any newish graphics card from ATI or Nividia that didn't have exceptional performance in StreetDeck, how good the card is for use in the extreme car enviornment is another question though.
512MB of ram, no more, no less is your best bet.
If I buy SD today....will I get a free upgrade in April? And will this upgrade fix the NAV problems Ive been reading about?
I have a big vacation planned in May for Florida and want to use the NAV daily. This will be my first NAV purchase. Should I wait, or should I jump now, so I have time to work out any kinks with my hardware. (UMPC Samsung Q1P)
Trial version is running fine, but no NAV.