alpine iva w205 accessories?

I have a 2005 Pontiac GTO, last year I had the local BB install:

Alpine CDA-9885

front speakers = SPR-17C

rear speakers = SPR-17S

rear deck subs = JL Audio 2x 8W0

Amps = Alpine MRP-F450 and a MPF-M450

Also a pair of tweeters in the dash, I don't remember what they are.

I am wanting to upgrade so I have bought the following:

Alpine IVA-W205

Sirius SIR-ALP10T

For the trunk a Alpine SWR-1042D and another Alpine amp MRP-M850

I will be adding the Alpine Nav unit PMD-B200

Should I add the Alpine PXA-H701 Audio Processor?  Or anything else?  Do I have the right stuff?  Any other changes I should make?

Thanks, Tom

Will all this work together?  Will it all connect and work properly?

Should I buy the PXA-H701?  Is it really needed?  Will it make that much of a difference in the sound quality?

Do I have the right speakers?

Any issue using one amp for the JL Audio subs and a second amp for the Alpine sub?

Or just in general, any concerns or suggestions?