The reason I would go with JBL is because I have had some of their random equipment for different things, and I have always been happy. Sure some of their car audio stuff is pretty expensive, but if you can find them for a good price they are solid. I have really wanted to try some GTi subs, but the fact that they are D6 ohm is a downside.
Massive has those nifty Nano amps and their comp sets are nice. With either setup I would either want a Pioneer 80 PRS or a Kenwood X996. I wanted an Alpine HU for awhile, but now they don't seem as appealing.
Otherwise I'd go all Alpine. All Type R or X with PDX amps and a 9887 or the new equivalent. They make good stuff while albeit pricey, hold their resale value really well.