Switching back to Mac from PC,any advice please

[system]

After 4 years on PC I am looking at switching back to mac as I am fed up with windows problems(nothing zbrush related mind you),viruses,registry crashes and generallly a little over the entire OS.I am thinking of getting an Imac with these specs (below) as a cheaper alternative to a Mac Pro.Do you think these specs would cut it for sculpting up to 12 million polys?There is an option to upgrade the processos to i7 and ram to 8 GB but that will put me almost in the Mac Pro range.
Any suggestions would be greatly appreciated
thank you
jon
27-inch: 3.1GHz

• 3.1GHz Quad-Core Intel Core i5
• 2560 x 1440 resolution
• 4GB (two 2GB) memory
• 1TB hard drive1
• AMD Radeon HD 6970M with 1GB

[ambient-whisper]

what i have been doing lately is making sure i got malwarebytes installed ( $20 )
it barely uses any resources, so it will run in the background from time to time…, but wont slow anything down.

thats it. other than that, good hardware, and thats about it. no viruses here as a result. without malwarebytes, i used to get problems with windows quite a bit ( win7 )

otherwise, winxp x64 was the best os that ms has ever made. i ran it for a few years without firewall or nothing, and had no viruses windows 7 though… got attacked within a day, so i had to resort to malwarebytes.

the mac has its own issues…spinning beach balls of death… hardware that you cant really upgrade, and you are limited by choice… lack of settings, so you cant turn off vsync if you wanted…and often second rate software ports. take modo… it runs a lot better on windows. zbrush 3.2 ( first release ) was a really limited bug fest…maya, houdini, etc all run much better on windows.

you trade in some problems for others. thats all im saying. i like macs, i have a few, but my main workstation is a windows machine for a reason.

i guess it depends what you are doing as well. if you were developing games, your options would be limited as well. crysis/sandbox, UDK are windows only.