i think really the only two main glass tank companies are Perfecto and All-Glass (AGA). Both of them have tanks that are drilled. i think the 65gallon is in the size range you want. as for overflows, AGA uses the mega-flow, which is usually on the left side on the back wall, and is rated for 550gph. this is nice, but if you have a narrow tank (like a 55) it takes up a lot of space. the perfecto corner-flow i think is rated for 600gph, is located in the left corner, doesnt take up as much space imo, and also has a removable front panel for cleaning. i dont know about warrenties for each company, but ive always used AGA.