... if you want it to be portable, don't even look at all-in-one desktops... looks at laptops.
If you are concerned with just running the one software and being able to store photos, almost any machine will do.
The way to shop for a new computer is to figure out what you want. Once you know that, you just look to see who has the best deal.
You can start here and then filter by the dollar amount that your budget allows. http://www.newegg.com/Store/SubCategory.aspx?SubCategory=32&name=Laptops-Notebooks
Once you find a computer you like, you can then look elsewhere if you want to see who has the best deal. It also helps to read reviews, etc.
~Sovereign
Hi There. I am a currently replacing my laptop and cannot figure out the right one for me. I am a photographer and use Abode photoshop 7. I need either a laptop or an all in one desktop (must be portable) but am on tight budget and need to get as much for as little money!
Have no brand preference.
Thanks for any help and advice

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic