Im the OP and have learned a lot from your answers, such as the scanning isn't what I need to be concerned about but the editing is. I'm going to be using Photoshop Elements to edit. The computer I'm looking at getting is a Dell with the following:
Processor & Memory:*
4th Generation Intel® Core™ i7-4770 processor 3.4GHz (8M Cache, up to 3.9 GHz)24GB Dual Channel DDR3 1600MHz - *4 DIMMs
Drives:
2TB (7200 RPM) Hard Drive + 256GB Solid State DriveBlu-Ray Drive (Reads BRD, Writes DVD/CD)
Operating System:*
Microsoft® Windows 8.1 (64-bit)
Graphics & Video:
2GB AMD Radeon HD R9 270
My only concern is Windows 8, but thats another topic altogether.
Thanks to all for your advice!