Anyone have suggestions of tools to quickly create spacers like these using 3/4"+ MDF?

Plastic 6x9 Spacers

The outer square shape is no problem, but I don't have a jigsaw for the inner cut out. Of course I can go buy one if you guys think it would be able to do the curves of the 6x9 just fine, or would a dremel rotary type tool be better? Suggestions?

I need a raise of at least 2.5" for the 6x9s from the deck, and I don't think those plastic ones would do much for the sound.

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Jensen VM8012 In-Dash DVD Receiver w/ DVD-RW/SD Memory Card/USB Support (Xvid/AC3 Capable)
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Subzone dual 1.5 cu. ft. Net. Int. Vol. Vented Box @ 38Hz
JBL GTO75.4II 4-Channel Amp
Fosgate Power Series 6x9 Coaxials
Kicker KS60 Coaxials

jig saw... you can cheap ones from like wal-mart for $20 its the easiest way to do that. and then you'll have one for if you build sub boxes and the like