Playing on short it's pointless when You cannot make controlled offers with expiration dates. You don't need to be market guru to hit the nail few times a week with cold feets and planing ahead.

I recommend kraken.com, their exchange system is great for novice.
If i'm not mistaken ledger is now available on btc, so if You have patience, know how to draw trend lines and know how to determine bottom/top in current channel You will be able to make additional 0.1-0.2 btc per week playing safe on kraken (more with ledge). On the other side, this exchange have small volume, and usually sits a little lower than USD exchangers.

If You want some controlled gamble with playing btc - BTC-E.com. I have a luck of hitting this beautiful spike this year (270$ usd from, as i remember, 220$) made x10 profit. This spikes there are pretty much reoccurring, if You look at history charts, there's 2-3 a year. Hold 2-3 btc, put price always 50$ usd higher, check every day, hit spike, sell on other exchange. Additional 1-2BTC per 6 months.

I assumed we are talking about 2BTC, not more.

For now, if You would want to try some speculating LTC seems good. Profits will be much easier than on BTC.