What do you think of this load and and what else do i need.

Looks like the amp you have picked isnt gonna do the job for that sub. I dont think the sub will end up getting enough power.

The subwoofer you picked is rated at 500W x 1 RMS @ 2ohms. (or 250x2 @ 4ohms)
The amp you picked is rated to deliver 400W x 1 @ 4ohms. (or 100x2 @ 4ohms, or 200x2 @ 2ohms)

That sub is a dual voice coil sub and presents a 2ohm load to your amp.
That amp is not designed to run in mono bridged at 2ohms. However, you would be able to wire a channel to each coil of the sub (since it is a DVC sub) and each coil would get 100W. But that is way too little power.

A better subwoofer match for the amp you picked would be something like this: Rockford Fosgate P310D2
10" dual 2-ohm voice coil subwoofer and you would want to wire it up like THIS. You would be utilizing the 400W x 1 @ 4ohms method to hook it up to that amp.

Now a better amp match for the subwoofer you picked would be something like this: Rockford Fosgate 501bd and you would wire the sub to it like THIS. This would be utilizing the 500W x 1 @ 2ohms method to hook it to your sub.

Personally I would pick the latter option.

I agree with Mystifier. Since you haven't purchased an amp, do not get a 2 channel amp and bridge it. That just isn't necessary these days with all the mono sub amps available. Any combination of car audio equipment is about correct matching and not abusing the capabilities of any or all pieces. There is no magic involved, just good planning and common sense. That amp is not good for that combination in any way you can configure it. It would only lead to a system that would be less than pleasing, because the sub could not function to its capabilities

i have come to the conclusion that everyone on stangnet.com has a pretty crappy system planned out for their car. everyone thinks that rockford is a good brand. they have decent products but for the price you are willing to pay for that speaker you can get better. go to a caraudio forum ie: caraudio.com and learn about nonmainstream brands...