I normally hate the altcoin world but my old miner just isn't worth much on the bitcoin network. What might I mine that has a reasonable trade in value for bitcoin. Ideally I can use poloniex to trade or some other respected exchange. I don't want to hodl the altcoin, just mine it and sell.
I normally hate to read that kind of crap... and that doesn't change especially now 
: so go back to btc mining with your outdated crappy non altcoin miner
you are not worthy of altcoin <3 Welcome to altcoin world, sed
My tip for you: Just stay with BTC, except if you find a good multipool that does BTC and altcoins (not just altcoins).
If you notice a new SHA256 coin arrive at the scene, you could mine that (if it has some value ofc), and trade it after it hits an exchange, hopefully at a nice price.
IT IS FOOLISH to mine coins that are worth less (so on an exchange) and hold them till they rise.
You're better off mining the more profitable altcoins/BTC, selling them and buying your new favo coin with those shiny satoshis.