I'm not an Aperture user but I've seen Camera to Print. I would say that while C2P is heavily based on ACR for RAW processing it might still provide you with useful info. Softproofing is done in Photoshop. There's also a chapter on Photoshop color settings and printing from Photoshop with different printers from Canon, Epson and HP (IIRC). Discussions about RIPs, books, resolution, scanning etc can also be helpful.
I can't decide for you but the investment is not that great. Others might not share my opinion on the benefit of C2P.
Here's the list of the videos included in C2P: