Need help with building desktop for OSX+windows 7

so my laptop just died..

now planning on building my own desktop
i have some basic knowledge about computers, but never put pieces together before
budget is around $600 - 800, depends on what kind of specs i get

desktop is for regular usage, i don't do gaming
so mostly Microsoft office, Photoshop and Solidworks(i'm a engineering student)

i have dual boot mac + win on my dead laptop before except no driver for wifi card (3945abg)
and i want a desktop that runs Mac OSX and windows 7 :)

sorry if i have posted this at a wrong section, im new here :)

thankyou

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