If you want good low-end but still have good top end then get a 2 into 1 carb setup. They are really easy to install and really easy to jet. If you look on ebay they have them for cheap. Well first thing you want to get is exhuast of coarse that makes any banshee come alive. A cool head will give you more low-end and better cooling. Then you have all the other good stuff like big bore kits and strokers, cheetah cylinders, nitrous, turbos...... but that's if you are not affraid to put money into it like you said. If money isn't an option than neither is how much power you can have.