I currently have a macbook pro from mid 2009, in the basic option.
I have just upgraded the memory from 2gb to 8gb. But my photoshop has been lagging so much, I thought I've had it with this. I've ordered a LED monitor from samsung that is yet to come, but what the heck, I think I'm gonna get a pc with another monitor. The problem is that I dont know too much about computers, and I think I've found a pretty good deal for a decent computer on ebay. Check it out for me. It will be mainly for digital painting and some internet. NOTHING ELSE.

http://cgi.ebay.com/Dell-XPS-8300-Qu...#ht_3039wt_986

Features/Specifications:
Dell XPS 8300 Core i7-2600 3.4GHz Desktop

General Features:
Stylish chassis
Microsoft Windows 7 Home Premium 64-bit pre-installed w/CoA
Intel Core i7-2600 3.4 GHz quad-core processor w/Intel Hyper-Threading Technology
Sandy Bridge microarchitecture
Max Turbo Frequency: 3.8 GHz
8 MB Intel Smart Cache, 5 GT/s DMI speed
Dual-channel DDR3 memory architecture
8 GB DDR3 1333 MHz SDRAM (16 GB max.)
1,500 GB (1.5 TB) 7200 RPM Serial ATA hard drive
DVD±RW DL Serial ATA drive
ATI Radeon HD 5770 1GB GDDR5 PCI Express Dual DVI/HDMI/DisplayPort video card
Integrated Realtek ALC887 7.1-channel HD audio with THX TruStudio PC
Integrated Broadcom BCM57788 10/100/1000 Gigabit Ethernet LAN
Dell Wireless DW1501 mini PCI Express IEEE 802.11b/g/n Wireless LAN
Built-in 19-in-1 digital media card reader
460W ATX power supply

For 717 dollars. I think it's not a bad deal at all.