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It is up to you, but I have always looked for vehicles that do NOT have any mods already. One, if they know you want to the mods done, they know you are willing to pay more for them. More importantly, there are many shortcuts that can be taken on many of the mods or "upgrades", especially when we are talking about a vehicle of this kind of value.
Why not pick up a stock truck, and do the mods yourself, or at least at your direction. At least you know you arent buying duct taped electrical connections and half-a$$ed mods that could end up costing you down the road...
Another common theme among many people who mod cars, although this applies much more to import cars and such, but they abuse their cars more than Mrs Smith who is driving her kids to soccer practice in her brand new tahoe/yukon... just my opinion, and some food for thought...