At the end of the day i would say thats a matter of opinion :trbtjrjq:
If opinion or cost came into it there are also many other manufacturers worthy of consideration. The DM7080HD is the best machine on the market. Since it's launch it's pretty much forced the Duo2 into a price dive and knocked it off the perch. The best always costs money, facts are facts.
The DM800HDSE has been a phenomenally successful machine. It's still relevant with a modest v2 revision and it's small form factor and internal HDD have endeared it to many. It's also spawned a whole clone industry all of it's own.
If price is an issue and the OP wants a top end machine then the Duo2 is in the mix. The lower models of the VU range are certainly off the mark and are a probably bit late to the party. The Solo2 was and still is a good machine but getting a bit long in the tooth. At current prices the Duo2 makes more sense than the Solo2.
Prices wise if you 'must' shop around a Duo2 can be had for £285.15 delivered with 24mths warranty from authorised German sellers. It will cost more in the UK because Germany is VU's main EU market. It all happens in Germany you see.