It's your run and you can take whomever you like, but honestly 1800 seems a little high. I mean TFB/EC SM shouldn't need BH gear to accomplish. :P
I've seen people with 1200 mainstat pull off some crazy dps, and honestly a person with lesser gear who knows the fights would probably be preferable . Plus if you guys are geared for the HMs anyhow
, bringing a slightly lesser geared player shouldn't be a problem as long as he isn't hindering the group in any way.