Jamie,
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:
01_Introduction.mov
02_PrinterModels.mov
03_CompareImages.mov
04_Optimize_Calibrate.mov
06_JPEG_BitDepth_ColourSpace.mov
05_Scanning_Film.mov
07_Optimal_Raw_Processing.mov
09_Profiling.mov
08_Noise_Reduction.mov
10_InputSharpening.mov
12_Resolution.mov
11_PhotoKitSharpener.mov
13_PhotoshopColourSettings.mov
15_Printing_from_Windows.mov
14_SoftProofing.mov
16_CS2_CS3_PrintSettings.mov
20_Books.mov
17_SolutionsMultipleSettings.mov
18_Print_from_Lightroom.mov
19_RIPs.mov
and Extras:
READ-THIS.txt
Matte-Template.xls
MidTone-Adj-Actions
MidTone-Contrast-Adjusments.atn