Again, why do this with a modular? You could go nuts on eBay if the objective is effects processing; the same amount that would get you a modular system could ALSO allow you to fully populate a 12U rack with amazing processing gear and a small desktop mixer to control the whole mess, with beer money left over at the end. And while Eurorack modules go for no-joke money, studio-grade processors are getting blown out on the used market for dimes on the dollar.
Modular synths ARE NOT a necessary device. NOT. NECESSARY. They exist these days because 1) there are some of us out here who need them to get into sonic territory that's very uncharted or 2) a sizable contingent of people have become convinced that they ARE necessary...until they get hold of one, and then you lose about 2/3rds+ of that crowd when they discover that a modular is neither a "magic box" nor "easy". Naturally, this'll make for a very interesting used synth market in a decade or so...but I'm pretty sure that wasn't an intended outcome.
A good 75% of prospective modular synth buyers would probably be far better off, more productive, and less frustrated by something other than a modular synth. Trust me on this. I know they look cool and all that, but unless you're VERY certain about both the direction of your music AND your hardware capabilities, you're apt to find yourself in the deep end of the pool very quickly, to say nothing of the smoking hole in your Magic Plastic.