I have delt with Aim Surplus, Southern Ohio gun, Century arms and Samco and never had any problems yet. Some of my best deals have come from Aim with there specials.
I have heard great things about Empire arms too. He is a tad higher in price but he rates his guns lower so your getting a better condition gun. I never heard one thing bad about Empire arms.
Overall its the luck of the draw......I been really lucky so far even with gunsamerica and auction arms too.
BTW; You will make your $30 back on your first purchase....you can get a discount on ammo and accessories at
www.midwayusa.com too and other places too by having your C&R its more savings than just guns.