I've got Comp Cams rockers on my 331 stroker. I was shopping around for the lowest priced set, but after talking to a local race motor builder, he advised against going the cheap route on rockers. You get what you pay for. Also since you have screw in studs and guide plates already, I'd shop for a set of 1.7 rockers to increase the lift at the valve a little, they'll cost the same but you'll get a little more performance with them. Just make sure that with them, you don't exceed the max lift for the springs and you order them for the size studs you have ( this will be either 3/8 or 7/16)
I bought Crane full rollers for less than $200 a set at Summit. I was just gonna go roller tips, but they were almost $150, so I went full. The Crane are nice, and seem to be the cheapest full rollers on the market. I am also using RPM heads.