So let me get this straight. If sputniks driver ends up working for windows 7 64bit, once he releases it, we can have a dac for $80 with a craptonne of ild files to go with it, and if you buy pasta
you can set yourself up for show creation and playback reliably for about $180. (the italian dish software is $100 if the author charges $20 for a dongle so your not tied to one laptop). Yes it can be obtained by other means but software developers need to eat too. That combo costs less than a decent 445 build. Consider the ishow package for $80 there abouts as a dac and ILD frames package. The other half (pasta) is your playback and show presentation package. You need both if you want to reliably play shows on your fancy new 6 watt projector
Thats pretty good going. For someone to get into laser shows on the cheap it would simply require a reke, an ishow and pasta, and you'd be set for under $500. The rekes are highly geared toward upgrading, and I would simply toss the internal show card, wire the ilda port via a stanwax ilda breakout (or similar gadget on ebay) directly to the scanners and lasers, and then as funds permit, upgrade the lasers to analogue units. You'd soon have a kickass projector if you stuff a few hundred milliwatts of green in there, a blue and a doublet of those mitsu diodes at 637. The other thing I'd do is wires a relay across the keyswitch, and out via an E-Stop, back to the relay, so it can cut the power to the lasers if the key is off, or someone mashes the button.
I would go the above route if I hadn't already sunk over a grand into my home built projector. Keep us posted on your driver sputnik. As soon as its available I'll pop a reference to it on the projector wiki as a cheap software/hardware combo to get into scanning.
Only one thing to note - the ishow is TTL only, so your going to need a new dac if you upgrade to analog and want to take advantage of the bazillions of colour combinations it offers.