Depends on what your brewing plans are. Personally, I like to go slightly bigger than my immediate needs. For benchmark, the setup you're looking at would've been too small for the 10gal AG barleywine I recently did.
But, for about another $50, could double your batch size potential and triple your burner output:
- High Pressure Bayou Classic burner. $49 and 185,000 BTU. Can boil 10+ gallons pretty quickly. Decent quality. I use one and it works great for me.
- 60qt heavy-duty stock pot. Great for 10 gal batches with space for boil-over insurance. Got mine for $45 Sam's Club online. 1/4" walls with nicely riveted handles. Plan on upgrading eventually to stainless, but in no particular rush.
Hope this helps. Good luck!