Hi, you would need one of these:

http://www.caraudiodirect.co.uk/audi...or-p-2490.html

This takes the speaker cables from the BOSE amp and converts them to 2 RCA. You will need a HU that has 2 RCA connections, that Pioneer is OK as it has 3.

Regards to HU it all depends how much you wanna spend. I have the Alpine IDA-X305 which is like 250 great ipod control but no CD slot or built in Bluetooth (most HU you need to buy a further accessory to allow bluetooth).

This JVC seems to fit the bill and has built in bluetooth but again its around 250, it also looks like JVC are replacing it with a newer model:
http://www.audio66.com/product.asp?i...=&man=2&main=1

I've used Car Audio Direct a number of times orders always correct and next day delivery too, nothing but good things to say about em.

Hope this helps