Spud, I know it sounds like a lot, but you've got a $50K car and you want to take good care of it. I've bought Helms manuals for all my cars since 1978 and don't regret any of it. You will probably save more than the cost just in the mistakes not made. Cheers!
Another thought: if you have a good dealer and have a specific thing you're looking for, the service mgr. will let you see the older service manuals, may even copy pages for you. Good luck!
I was able to get all three GM manuals for my 2005 SRX on ebay for about $75. Stacked on top of each other they are about 1 ft. tall. Worth that and more as I have used them so far to change out my non-working nav system with one from a wrecked SRX, install an ipod adapter and headrest dvd system, install upgraded rotors/brakes, and change out the front turn signal bulbs/sockets. So far I figure I've saved over $5000 vs. having the dealer do these repairs/upgrades.