What to do?

Newbie here, and need some suggestions.

I've been doing photography for quite a while now but took a break to finish off school and now would like to jump back in.

Here's my gear list...

Nikon D300
Nikon D3200
Nikon 17-55 2.8
Nikon 50 1.8
Nikon SB-800
Sigma 10-20
Yongnuo Flash

I'd like to do mostly wedding/engagement/portrait photography because it's what I'm most comfortable with.

My question is...Should I sell my d300 and use the 3200 as my primary camera? After using it a couple times I think it would suffice using it in most situations. I could use the money I get from the 300 to buy a couple (or one) lens. Was thinking of getting an 85 1.8 or maybe a tele (70-200 2.8) or of course, I could use that money and buy a new camera like the d7000 or d700.

What do you guys think? Any help would be appreciated!