Olympic weights or heavier kettlebell?

Living on a limited budget sucks. So I have to decide between a heavier kettlebell or Olympic weights.

I have a standard bar and weights (over 400 lbs). I also have a 40lb kettlebell, which is rather light for two-handed swings but still good for one-handed swings and most moves.

I can pick up an Olympic set of weights off Craigslist for $150 to $200 right now, but it looks like I'll have to buy some additional weights as the sets are all under 300 lbs.
I can also order a 70 pound (or perhaps heavier) kettlebell for $120 or so,

So what would you do?

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