If you want to stick with Alpine and want dashboard tunability the H701 is THE way to go.
I don't know if it will work with your deck, I almost think that the controls are only compatible with IVA series touch screens and the RUX-C701.
Call Alpine to make sure that you will be able to control the H701 from the screen.
I think ALL Alpine ai-net decks can send signal to the H701, but the IVA-W200 is a great option because you get optical signal out.
For what it's worth, a IVA-W200 or IVA-D310 plus H701 combo can be gotten from the states for around 700-800$.
Heck, a guy on here has an IVA-D310 for sale, but with a faulty dvd transport. Just buy a cd changer to put in your glovebox and an Ipod cable.
All that being said...
The H701 IS overkill if you are only going with a 2 way front stage, but once you consider a 3 way front stage, or 2 way + rear fill it becomes a nessescity.
Personally I'd MUCH rather have too much tuning ability than not enough, and I definitely prefer having it controllable from my seat.