ok basicly the Wh1C is what you have now, the HX35 is the one that i have been recommending the the HY35 is what was put in the last 5.9s and the the HE351CW is what is in the new 6.7 cummins put in the dodge truck from Late 07 thru present year.
The HX35 will hold up to anything you can throw at it.........unless you block the waste gate from opening.BOOM!
There is also a HX40 but by the time you're there, there is way better aftermarket turbos that will out perform that one.
The HX35 is just a well rounded turbo(and cheaper) for what you're doing then spending the big $$$$ to go aftermarket.