Which mobo to buy

Hello everyone,

I was wondering if anyone had a suggestion as to which mobo I should buy?
I want to upgrade my current system but keep my cpu for now.

Below is my cpu, vid card, and memory specs. I have the option of using my current Micro ATX case or using an ATX one that a friend has given me.

I would like to have the ability to upgrade the processor in a year or so, but for now will have to keep the current cpu. I am on a budget so I need something under $100.
The computer is used for heavy photo editing as well as some mild gaming. I may attempt to overclock once I learn more about it.

Any help or suggestions would be greatly appreciated.

Processor
Name Intel Pentium 4 530
Codename Prescott
Specification Intel(R) Pentium(R) 4 CPU 3.00GHz
Package (platform ID) Socket 775 LGA (0x4)
Core Stepping D0
Technology 90 nm
Core Speed 3000.2 MHz
Multiplier x FSB 15.0 x 200.0 MHz
Rated Bus speed 800.1 MHz
Stock frequency 3000 MHz

Graphics
Name NVIDIA GeForce 7600 GT
Revision B1
Codename G73
Technology 90 nm
Memory size 256 MB
Memory type DDR3
Memory bus width 128 bits
PCI device bus 1 (0x1), device 0 (0x0), function 0 (0x0)

New Memory
4GB 2x2GB DDR2 Corsair CM2X2048 - 6400CS
800MHz