Install Windows 32 or 64bit?

I must install Windows (Vista Ultimate) to use some AutoCad apps. Should i install 32 or 64bits version?
I have the new iMac 27", 3.06Ghz, 4 GB Ram.
I had heard that Parallels 5 is the best of "fusion-OS-program"!?

Hi WhiteSwed,
Apples BootCamp lets you install a 32-bit Windows Vista onto an Intel-based Mac.
And 64-bit Windows Vista on these Macs http://support.apple.com/kb/HT1846
Windows 7 support is currently in the pipeline.
See the Tech Specs of BootCamp here http://support.apple.com/kb/HT1899
And the announcement of Windows 7 support http://support.apple.com/kb/HT3920
Quite a lot of people have already installed Windows 7 even without official support from Apple.
The hatter has an ongoing thread full of helpful tips about Windows 7 http://discussions.apple.com/thread.jspa?threadID=1866970&tstart=15
For useage of AutoCad and especially the mostly not-so-small files I would suggest Vista 64-bit and a RAM upgrade to 8GB.
With 32-bit Vista it won't let you use the full 8GB.
Regards
Stefan

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Hi chrissy_h,
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The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc. The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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Hi
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