Hell yeah, Macs rule.
This is the best website to visist for mac supplies and stores: Apple Store
My personal choice is the Powerbooks. They are powerful and they have nice GHz's. The 17 inch Powerbook has a 100 GB harddrive 
Its powerful for an laptop. It can be pretty expensive, but worth it.
Here are the Specs for a 17 inch powerbook:
17-inch TFT Display
1440x900 resolution
1.67GHz PowerPC G4
512MB DDR333 SDRAM
100GB Hard Drive
ATI Mobility Radeon
9700 (128 MB DDR)
Backlit keyboard
Gigabit Ethernet
FireWire 400 & 800
Digital/analog audio
DVI & S-Video out
Dual link DVI
Powerbooks
The Power Mac G5 is amazingly NICE, My dad owns one downstairs in my house... And it is so beautiful and it works peacefully and mighty FAST. I can play all different kinds of games i want on the G5 because it is so powerful...
This is the specs that my G5 has:
Dual 2.5GHz PowerPC G5
1.25GHz frontside bus/processor
512K L2 cache/processor
512MB DDR400 SDRAM
Expandable to 8GB SDRAM
160GB Serial ATA
8x SuperDrive
Three PCI-X Slots
ATI Radeon 9600 XT
128MB DDR video memory
56K internal modem
Notice that it has 160 GB Serial ATA drive... thats alot of storage. Also 1.25 GHz processor is perfect for all kinds of games that are out today, Its fast enough to play Doom III and Half Life 2 combinded.
Apple G5
The Mac Mini, Is perfect for college students or someone like you, That is what i choose for you. I suggest you to get the Mini for a couple of reasons, They are cheap, Small and afforable ($499). I think i am getting the mini when i leave for college, But i'd rather have an ibook since it is portable.
^That is how big it is compared to the moniter and the keyboard
The Size of a Mac Mini:
The Specs:
1.25GHz PowerPC G4
256MB DDR333 SDRAM
ATI Radeon 9200 with 32MB DDR video memory
40GB Ultra ATA hard drive
Combo drive
DVI or VGA video output
AirPort Extreme and Bluetooth optional
Now thats pretty powerful for something so small like that!
I would suggest for you to wait for the iBook G5 
