Thinking about a tank upgrade - some questions

I'm posting here since I'm the early planning stages and not quite ready to buy yet... please forgive any text goofs, I'm using my phone.

I have a nice black stand and canopy for a 75g. ideally I want to buy an acrylic 75g that is the standard footprint of a glass 75 thatis drilled for a sump/ fuge. would be even better if I could find a used one fs with a light. Are these commonly available or am I wanting something that would be a custom job? if this would be really pricey, I'll probably scrap this idea and sell my stand/canopy setup and look for something else. I would like to keep it affordable and do upgrades as I go.

I'm also trying to get an understandingof how to do a sump and fuge... Are these normally combined? I am not looking to do any drilling or building myself.... I'm hoping the upcoming tank tour will be helpful for me, but I'd appreciate any other tips on where I should start. all my experience in saltwater has been with biocubes.