I bought the Sony A33 and was pleasantly surprised by the amount of inexpensive and very good Minolta lens available.
I'm not an expert in either, but Adobe Photoshop is for creating / updating images, while Lightroom is aimed at photographers to organize, touch up and share their photos.
I downloaded the trial of Lightroom and liked it, but am using Aperture on my MacBook Pro at home.
I'm sure others can chime in and give you more details on photoshop / lightroom.