just wondering what injector brands are better quality than others

The disk style injectors are supposed to give better spray patterns. Fuel Injector Clinic makes the disk style for all their injectors. I plan on getting a set myself.

what size are you looking for? i have had no problems with the three different sizes of mitsu injectors, i know there are a ton of people running RC injectors (never ran them myself though). the GVR4 510's and the 1G 450's have single nozel but the later mitsu injectors (EVOIII 510's and 2G 450's) have a dual nozel on them that is supposed to split the fuel into the head for better even combustion (sprays in a figure 8). the EVO MR 560's that i am running have 4 holes for the fuel to come out the bottom and when i was talking to a tech from the plant at the mitsu day he said that he had three sets and when he had them flowed they were all closer to 600cc.

i like the mistu ones personally because they get the job done and, for me atleast, they were cheaper than buying RC's or another aftermarket company.

i've got the stock mitsu 450's....i'm looking at upgrading to something that would support an evo16g or more ....so 550's or larger

I have a set of 650s I'd be willing to part with. You won't want them for anything much bigger than a 16g, but they're a perfect mate for that turbo.

i have a set of 550 RC's and i am running a big16g turbo at 22 to 26 psi and they work wonders i would part with them for $150 payed $375 so if you want them let me know.