Pete:
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Sounds like a great find - you 'stole' that VX for $15K.
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I spoke with two dealers recently that echoed your (same) thoughts almost exacty - the VX depreciation rate has slowed and the low mileage examples (especially) are fetching a good price.
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And unlike some/many other low production vehicles, most VX's are used (and used ........ and abused) - so the 'supply' of VX's is likely to tighten.
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The factory Isuzu warranty is transferable - but is 'halved' to the subsequent owner; the 5 yr/60k portion is now 2.5 and 30k - and the 10yr/100k (powertrain) is now 5yr and 50k. So the good news is that are covered. Call Isuzu (800 number) with your VIN to to process the transfer of your warranty.
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t2p