ballast replacment

I am now paying the price for going cheap on my lighting system. I went and got myself a 300$ Aquatraders light(2x 250wmh, 4 pc) and now after a month or so my first mh ballast has blown. so here is my question. What kind of replacement ballast should i go with? i see all kinds of posts about...

This is my first post so y'all be genital on me lol. I was given and Odyssea 2x250 w mh light fixutre, and before everyone starts in about Odyssea. I already know all the ballast are junk. Here is my question, and i have looked long and hard to try and find the answer. What ballast will plug up...