I have now a little more time to answer your questions.
first off - i totally agree with White-lite that 30K scanners are way better than 20K, but then again - the cost of the project. All projectors can be upgraded with new scanners later, but my experience is that I build a new one, rather then upgrading the old one. (The next build will be way better - every time. Partly explains the moneypit phrase)
If you feel confident to build your own projector, witch i highly recommend, you will be able to have a better bang for the buck. Half the fun is creating and building yourself. This forum is a goldmine of information and how to`s in building projectors. bare in mind that a lot of the more active users of the forum have been lasing for years and years, and have mindset of perfection. Perfection in this hobby will consume more money and time than you could ever imagine.
Personally I have had a good time walking into most of the "traps" and i have a pile of "cheap" Chinese lasergear. All this gear have helped me understand how things work, what works and does not. That for me is part of the hobby. I really would not tear apart my PlutoII, just to see how things work, but without the basic skills i have learned along the road, i really would not be able to appreciate the quality and show the proper respect for the PlutoII.
Now to the gear you need.
First off you need a case or box that will hold all the gadgets. Do not attempt to build as small as possible at least not as your first project. For me a baseplate of aluminum about 6mm thick 20X30cm would be a good start. If your build is not to powerfull and you fit in some proper fans in the casing, you would not need any more cooling. The hight of the box needs to be as high as the highest component in the build plus a couple of cm headroom. A good drill 3-4-5mm taps and steady hand is also required.
The 400mW module i described in my first post will come more or less aligned for all colours, so not much work there. It also saves the cost of dichros and holders. It also have a "Analogo" driver, that are capable of producing a wider range of colours than TTL modules that are either on - off. (No fading)
When buying galvos, there are a number of vendors delivering a full kit with all the cables - DB25 connectors and showcard. What you need is to drill the holes and fasten the parts.
Song recommended the QuickShow DAC and software, and for a really fair price. Not shure he will be able to sell just that for the price offered, but it is worth asking.
With the above items - you have all the components you need to get started making your own shows.
Feel free to ask if there are things or statements that are unclear.
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More projects than time available.
More projects started than finished.
More money spent than earned.
More failure than success.
Just got to love lasers!