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There's nothing wrong with buying a pre-built system. The Doepfer A-100 looks pretty tasty. There are quite a few manufacturers who make a pre-built system: Make-Noise, Roland, etc. Generally they come in a rack that's either full or mostly full. So to expand, you'll need to purchase another rack or replace existing modules. You can always keep the pulled modules until your ready to add another case.

If you have the funds up front to go that way, it's a pretty good idea.