Hi Ben,
Good to hear you'll try what you already have with the 18-200. If you really want another lens for wide field then it's hard to go past the Samyang 14mm 2.8 UMC marked version (new design optics) , especially in full frame use. Around $450ish new and $300 used. It's hard to beat unless you want to spend many times that amount. There are a couple of Canon versions on Gumtree right now. One caveat though would be its use with your 70d and the CLS filter - not sure - it might foul the filter. You'd need to check before committing or go full frame, if that's your desire anyway.
Best
JA
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