I have an SG05, SG06 and SG13 myself.
The SG05 is good, but you have to look at cooling carefully.
GPU has side intake,separate from CPU which is good.
Front air filter clogs regularly as mine is on carpet.
SG13 is essentially the same case with a revised front and can take a 140mm fan. It and its bigger SG01 and SG02 siblings are the original shoebox diy pc cases.
RVZ02 is similar in volume but its "flat" form factor makes it different to build in as it can be used vertically or flat like a classic console.
More contemporary SG13 reviews may help your investigations.