Supporting heavy hinged lids.

Hi all,
I am looking for a way to hinge a heavy chest lid such that it will remain open at a 60 degree angle.
The lid will be heavy as it will contain quite a bit of electronics: This is a "stealth" home theatre installation. I'm thinking up to 30kg (it probably won't be this much, but I like to over engineer) with a depth of 45 - 60cm, depending on whether I I hinge the entire lid or only 2/3 of it.
Any suggestions on how to support this. I've been wondering if I could somehow adapt gas lifts from the rear hatch of a car?
Thanks for any ideas
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