How to buy a sail?

I have had my boat for 2 years now. It was an oldish boat (1982 Tartan 3000) with old sails. I had other things to fix so I kept postponing buying new sails while fixing the other things. The jib finally blew. It was a UK sails 155% Genoa cut for racing. It must have been really nice when it was younger, but it still sailed really well even with all the mildew on it. I need to buy a new sail and don't know what to look for. I keep the sail on a roller reefer, I like to cruise but on occasions race. Sails these days are coming in different cuts and materials, many of which I don't know. I'd like something practical that sails well and fast. What should I be looking for?

My second question is about buying from small sail-makers. I live in Miami and there is a small sail-maker called Bremen Sails which people seem to recommend. Is it safe to buy a sail from them or it's better to go with Doyle, UK Sails or North Sails? Anywhere else I should look?

Thank you.

Kim