I'm a drafter and I use my play machine at home for my work-at-home machine too. I guess it depends how fast your dad drafts or wants to draft and render stuff. IE: my father is an architect and drafter but he is nowhere near as fast as myself or anyone else my aged on drafting on a PC. Where a fraction of a second delay drives me nuts, he doesn't notice. All he really wants out of his drafting machine is a sturdy reliable mule. I'm a fast drafter and like fast rendering and minimal stuters, so drafting works great on my gaming machine at home since games on the high-end like to use a lot of memory, processing and video rendering power. I'd say the two differences in my needs for gaming and my needs for drafting on the machine is HD space (CAD files keep getting larger and larger over time, but nothing like a standard PC game these days weighing in well over 1-gig on HD space) and frames per second on the display (gaming I like more than 50fps with minimal monitor delay, drafting I can deal with 20-30fps but still want minimal monitor display delay). Everything else though, maybe because I'm a PC junkie, I can't draft as productively as I could without. Large displays and multiple-screen displays are a plus too. Now if your dad was just doing email, word processing, and the occasional webcast or movie then I'd say get him something on the cheapo-end without hesitating.