The best computer is..

XPS 210

CPU Intel®Core™2 Duo

Windows Vista^® Home Premium original.
RAM: 4 GB
HARD DISK: 500 GB o
Price:
399 €

Dell Precision 490

CPU Intel®Xeon®dual core

Windows^® XP Professional original

Grafic card: 512 MB Slot: x16 PCI Express
RAM: 5 GB

HARD DISK: 1,5 TB
Desde
1.043 €

Dell Precision 690

Two CPU's de 64 bits Intel®Xeon®Dual core

Windows^® XP Professional original

High grafic resources
RAM: 8 GB

HARD DISK: 2 TB1
Price:
1.275 €


The XPS 210 is less fast and expensive than the Dell precision 690.
The Dell precision 690 is more expensive than the Dell precision 490.
The Dell precision 490 has more ram memory than the XPS 210.
The Dell precision 690 has a better operating system than the XPS 210.
The XPS 210 is cheaper than the Dell precision 690.
The Dell precision 490 has less ram memory than the XPS 210.
The XPS 210 has a better CPU than the Dell precision 490.
The Dell Precision 690 has the best grafic card.
The XPS 210 is the cheapest pc.
The XPS, Dell precicion 490 and the Dell precision 690, don't have monitor but the monitor is cheaper than the computer.

In my opinion the best computer is the Dell precision 690 becouse is faster than the other Pcs and it has more GB memory.