There is a difference in the 10 bolt chevys. The 8.5 inch is much stronger than the I think the other 8.25 inch. The smaller 10 will break pretty easy but I know quit a few folks that run the 8.5 with some serious HP and swear by um. I've know one guy that says it's held up better than a 12 bolt, but I take that with a grain of salt.
For what you say you have I don't think you will ever have a problem. Just pick you up a better rear end later when you can afford it.