The DWT rock outs are awesome wheels, for the price, they can't be beat. They are basically the newer version of the old DWT rolled lip yellow labels. I now run the DWT beadlocks all around, but I ran yellow labels for years on my desert racer before the beadlocks and only bent one, that was due to hitting a rock hard with a flat. Not a fan of the ITP Baja's, I used to bend about one a race (After one race in particular all four were bent!) then I switched to the yellow labels and stopped having to buy rims. Have never tried a set of DWT Evo's, but have heard good things about them, only problem is they are not offered in 4:1 offsets.
Personally, I would get the DWT rock outs, as I said, don't think you can beat them for the price. For rears, either buy a set of G2 beadlocks, or I think DWT also makes just a standard rolled lip, non beadlock version of the G2's. If you are just trail riding, beadlocks aren't really needed at all, but are nice to have, a little easier to swap tires.
I myself would never run Hipers. Lots of people swear by them, but I have seen to many destroyed out in the desert. Hit a rock hard enough and chances are you will just bend an aluminum wheel, but the tire will still hold air and you can continue with no issues. Have seen alot of Hipers crack after a hit, hard to hold air then. Have to slow down at that point, not what you want to do while racing.
As far as offset, due to the front end you are running, I would go 4:1 for sure. Is it worth the money to swap to a 4:1 wheel from stock? Hard to say. You will get a little less feedback through the bars with the 4:1 wheel. How much just depends on where you ride. Lots of rocks and roots, might be worth it. Lots of high speed graded roads, probably won't notice a difference.
Doug