should i try to get the NAVMAN 478 MIO? or too much pia? I thought it was similar to your mio400 or something or maybe I should stixk to the s series?

I find the "C" Mio series good devices and easy to modify.

I'm not at home this week, and have limited internet, can't be assed to Google it to find out what's special about the 478

As long as it has a 4.3" screen and at least 64MB of ram it'll be ok.

No idea where you're from, but consider a Binatone F430. In my opinion, it's one of the most versatile GPS devices out there.

If not, consider a China supplied open GPS device:
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If that's too big I've always liked the look of this one:
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All three of those will run iGo Primo 2 with 3D buildings.