Finally Got a Little Cash! Suggestions?

Well I am going to be doing a little bit of a power upgrade, since I am finally a little ahead on the bills and have some money in savings as well, so here are my ideas, I'm going to choose only one:

1) I have just enough money to go with a single turbo kit. I was thinking of going with B&G. I do have quite a few miles on the block, but everything appeared in good shape when I put the heads on. So I was thinking of going this route until it requires a rebuild.

2) I don't know if TW heads would be a big improvement over the ones I have, but I was thinking about it anyways, if it would increase the power a bit. How much more would you figure I would get?

3) Buy a 331 Kit and have it stroked out. Not sure if I would go with bigger heads right off or not

This car is no longer my dd so anything is open as of right now. I've been tinkering with little things, but need something else to take some time off my hands

That is kinda the way I am leaning, but I know there is a long wait time on it. I also know of some places to get just a hotside, but how hard would it be to make my own coldside?

Well I got about 3500 right now, so that would take care of the whole BG kit, then I would have to buy injectors and maf and pay for either a tune or buy a programmer of some sort. Do you know exactly what bends I would need and where I could get them or a package deal maybe. I guess I should probably do a little more research at turbomustangs, but in your opinion would it be worth it cost-wise to do the coldside myself?