The cart doesn't work. Not sure if you have dirvers in there, but going with the meanwell's is the best option, they end up being cheaper. You don't need a pwoer supply to feed the meanwell drivers. power supply's for a full LED setup will be more than $30, that's a big power supply.
The big thing with modular LED is that you don't have to screw around with soldering them. Unless you already own a GOOD soldering iron, it is not worth doing dull DIY unless you are going to save enough to make buying one worth it. The crappy heat iron ones will fry LED's, lots of people have been able to do them with that, but you're tempting fate. With the modules you can change stuff around at later days too, which seems like a cool idea. And also... who wants to solder 80+ connections :P.
And with the heatsink.. there's many opinions on them, and they're all pretty much just that. Look around for info on them, there's lots, people generally go WAY overkill with them, which isn't always a bad thing.
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