firebird frenzy

Alright i got my tranny rebuilt about 10 months ago for a "good price" and well let's just say it ain;t worth a sh*t. BUt anyways lesson learned. I was flippin through Summit where i get all my parts and i was having a hard time deciding which tranny top run. Cause it looks like either way i'm goin to spend about the same amount of money wheter i get it rebuilt again or just buy one outright. BUt my question was is there a core charge for these mail order tranny's? And the other does anyone have any experience with these brands. I'm running a TH-350 hooked up to a 350 which will hopefully soon be running about 350-400hp max when i get the cash available. I also saw that they have a Summit brand tranny for about 150 buxs cheaper, anyone know anything about them, the article says up tp 400 hp, but my lesson learned was the cheapest aren;t worth a crap