S.H.
I'm a professional photographer and Aperature is the standard MAC OS catalogueing and basic editing software (basic is actually pretty fantastic, not very basic) but if you want to do advanced editing, of course Adobe Photoshop is the way to go. I'd still get Aperature for the cataloguing power then see if you want to go further. PS is an investment.
Also, PS is a very powerful program. I've been using it since its first edition nearly 20 years ago and have never been apart from it for more than a few days but there is STILL a lot it can do that I don't know about. If you make the investment in PS, it's worth taking a class. If you use it for its most basic, no-educaiton-necessary features then it's not worth the investment. You can do all of that in Aperature.
Have fun!