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I believe most double dins only have up to 4 volt preouts, in fact i've never seen one with more than 4.. Anyway, among the DVD double din head units with 4 volt pre outs, i prefer the Alpines. If you need them to perform sound processing you could always just get the alpine processors like the pxa-h100 or the older pxa-h701 or the upcoming h800
I hype the Pioneer Z110BT/120BT/130Bt as that is what I have. It has 4 v preouts and yes it is a nav. If you really don't want a nav, you could check out some of Kenwood's offerings too. There top level one actually has a 5.1 processor built into it but it is expensive. Not sure of what else is important to you really. Is there going to be an external processor for eq, time alignment, etc? If not I would strongly recommend Kenwood's top two dvd offerings as they both have pretty good eq and time alignment built in which is huge for sq.