So, I recently bought a 2004 Venture. It's an El Dorado disability conversion and is fairly plain jane with the basic options such as A/C (front and rear), power windows / locks and cruise control. It's only got 53,400 miles (bought in October with 51,800 on it). It has the 3.4 litre with the THM 4T65E Transmission.
I've done a few things to such as front brakes, replaced the lines to the rear air ride, replaced the transmission / engine mounts and flushed the old coolant out and refilled with new Dex Cool.
It runs great so far, I will say I love the mixed (mountain and some highway) fuel economy of 17 MPG.