buzzard, I'm in the same boat as you, I had settled on VDO since they look like the stock gauges, however, since I received my TST cam plate, it looks like I need more than a 30lb. boost gauge. That's moved me over to Isspro.
I've invested quite a bit of time lately on the phone and PC looking for the best deal.
At the moment, it looks like it's between DIS of Texas and the Montana Isspro dealer. Montana (1-800-359-2819) is about 5 bucks cheaper on the gauges, however their 2 gauge pod mount is more is about $5 more. So it's a wash, They are within . 60 of each other.
Both say the boost gauge (p/n R8603) is on back order. How does this compair with your findings?
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"95" 3500, 4WHD, Ext cab. SLT, 5 spd, 4. 10 LSD, Rancho 9000's PacBrake, running boards, Mopar mud flaps