Your motherboard is a ATX board, meaning it is a full size board. I don't see anything about it being used in any pre-built models, so you case is probably an off-the-shelf case. you should be able to reuse it with no problems.
You could also reuse your optical(s) and floppy drive with no problems.
Newegg.com - Foxconn A78AX-S AM2+/AM2 AMD 770 ATX AMD Motherboard - AMD Motherboards
Combo - AMD Athlon 64 X2 7750 Kuma 2.7GHz Socket AM2+ 95W Dual-Core black edition Processor Model AD775ZWCGHBOX - Retail
and
SAPPHIRE 100265HDMI Radeon HD 4830 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail
Newegg.com - Crucial 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Desktop Memory
Newegg.com - FSP Group SAGA+ 450R 450W ATX12V Power Supply - Power Supplies
Newegg.com - Seagate ST3640323AS 640GB 7200 RPM 32MB Cache SATA 3.0Gb/s Hard Drive - Internal Hard Drives
$368 w/free shipping on the hard drive and a $15 MIR.
You could also reuse your optical(s) and floppy drive with no problems.
Newegg.com - Foxconn A78AX-S AM2+/AM2 AMD 770 ATX AMD Motherboard - AMD Motherboards
Combo - AMD Athlon 64 X2 7750 Kuma 2.7GHz Socket AM2+ 95W Dual-Core black edition Processor Model AD775ZWCGHBOX - Retail
and
SAPPHIRE 100265HDMI Radeon HD 4830 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail
Newegg.com - Crucial 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Desktop Memory
Newegg.com - FSP Group SAGA+ 450R 450W ATX12V Power Supply - Power Supplies
Newegg.com - Seagate ST3640323AS 640GB 7200 RPM 32MB Cache SATA 3.0Gb/s Hard Drive - Internal Hard Drives
$368 w/free shipping on the hard drive and a $15 MIR.