hi Bob, I use Aperture since v. 1, I've. love-hate relation with it, I've though about changing to LR since years, however aft using it a few days, I go back. One of the issues make me think about switching is the printer subsystem. It's crap!!!, did I mention crap?
I would recommendo you, soft proofing and printing in Photoshop.
Cheers,
Daniel