Use
Dustcoin.
It's great for comparing BTC to LTC, but I warn you against switching to a lesser known alt-coin. For example, Terracoin is said to be ~150% the price of BTC, but it is extremely volatile. It won't be like that for long.
That's why you use
CryptoSwitcher to manage switching coins. My Jalapeños mine BTC full-time, but my GPUs switch between several altcoins depending on what's most profitable at the time. Sample output from one of my rigs:
<<< Round 770 >>>
time: 2013-07-08 09:18:50
getting data... done
comparing profitabilty...
------------------------------------
Bitcoin: 103 (fee: 1, src: cc)
Bitbar: 141 (fee: 3, src: cc)
Phenixcoin: 154 (fee: 1, src: cc)
Freicoin: 81 (fee: 5, src: cc)
BBQCoin: 176 (fee: 0, src: cc)
FeatherCoin: 167 (fee: 2, src: cc)
DigitalCoin: 113 (fee: 0, src: cc)
Worldcoin: 127 (fee: 1, src: cc)
Litecoin: 162 (fee: 2, src: cc)
NameCoin: 3 (fee: 0, src: cc)
------------------------------------
=> Best: 176, mining BBQCoin
# BTC BTB PXC FRC BQC FTC DGC WDC LTC
# Median: 0 | 162 | 219 | 0 | 178 | 193 | 0 | 0 | 162
# Time: 0:00 | 47:20 | 24:20 | 0:00 | 10:10 | 23:50 | 0:00 | 0:00 | 22:40
# Total Median: 180
# Total Time: 128:20
As you can see from the time stats toward the bottom, it's spent most of its time mining Bitbar, followed by Phenixcoin, Feathercoin, Litecoin, and BBQcoin.