-You do not need to worry about viruses when you use a mac. -OSX comes with built-in firewall software that is easy to set up -the G5's come with gigabit 10/100/1000 lan ports -You can get the G5 with 1.6 Ghz, 1.8 Ghz, or dual 2Ghz processors -1 Ghz FSB per processor -the G5 comes with the superdrive (burns DVD disks at 4x, burns cdrs and cdrws at 16x) -G5 supports up to 8 Gigabytes of RAM -support for ATI radeon 9800 graphics card and has 8x AGP interface -has 2 serial ATA hard drive bays so you can add another drive later -built in support for dual displays -three PCI expansion slots, supports the new PCI-X interface I'd stick with the mid-range 1.8 Ghz model, as it is a better deal than the 1.6Ghz model and not many people can utilize the dual processor model The 1.8 ghz model specs are as follows: 1.8GHz PowerPC G5 900MHz frontside bus 512K L2 cache 512MB DDR400 128-bit SDRAM Expandable to 8GB SDRAM 160GB Serial ATA SuperDrive (DVD burns 4x, CD burns 16x) Three PCI-X Slots NVIDIA GeForce FX 5200 Ultra 64MB DDR video memory 56K internal modem Firewire 400 and firewire 800 ports USB 2.0 ports Optical audio in and out Analog audio in and out look more here: http://www.apple.com/g5 buy here: http://store.apple.com Any more questions please ask!