What breeds are best to add to my flock??

[camershek]

Hi! I currently have 2 RIR (rooster and hen), 2 silver laced wyandottes (hens), 1 silkie(not sure on gender) and 2 Cornish x meat birds. We have lost 4 of our chickens to a predator in the last week and a half and after we catch (or kill) him (or our meat birds are slaughter age) we plan to add more birds. My silkie will be alone in the coop all day so s/he needs some friends. My older 4 free roam all day but because Red (silkie) is so small I keep s/he in the coop and fence all day. Someone in my area has polish mixes and I was wondering if they are good with everyone else. My big 4 aren't in the coop at all during the day and sleep on a shelf at night so I'm not too worried about them getting along, mainly with my silkie.

Any advice is welcome
Thank you!

 

[BackyardFlock17]

Even though my ISA Browns are not considered a breed, they are wonderfull to have around!