Help finding power supply

Hello,
I am a first time computer builder and I have already built the computer and so far everything works, components are as follows:

Intel Core i3 3220 @ 3.3 Ghz

Crucial Ballistix Sport 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10600) Desktop Memory Mode

BIOSTAR H61MGC LGA 1155 Intel H61 Micro ATX Intel Motherboard

Western Digital WD Blue WD5000AAKX 500GB 7200 RPM 16MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive

MSI DVD Burner 24X DVD R 8X DVD RW 24X DVD-R 8X DVD-RW 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM Black SATA Model DH-24AS U88

MSI R6850 Power Edition 1GB GDDR5

APEVIA ATX-CB700W 700W ATX12V / EPS12V SLI Ready CrossFire Ready Power Supply - OEM

Now I know that the PSU is terrible and that is what I want to replace, so I need some options on a PSU that will be good for my build. My budget is less than $100 and it would take me a while to build up the money. Any opinions would help. Thank you!