I have a pair of Boston Pro 10.4 LF series. I used them with an Orion 225 HCCA, and at only 200 watts, they were probably the best SQ subs I have ever heard. Some others, like Alumapro, and Oz had some very very nice 10's, as well. However, I would let these go for $125, plus shipping. Of course, everyone has their own favs, but you did say you were on a budget. These are in good, working order, and look good cosmetically. BTW, they play best in a .75-1.25 CFT sealed box. And, have 250W cont pwr rating. Machined aluminum basket, and poly cone. They can be bought NEW through new old stock through Boston for $280 each. So, they were pretty expensive stuff when they were first released.
Just so I don't get accused of trying to foist my stuff off on you, I was planning to put them on
ebay, anyway. Just thought I would give you first shot. I think Blue is on vacation, or busy working, but he agrees with me about the SQ of the Boston 10's.