Can anyone recommend the best website for bitcoin valuation charts (in USD)? I'm just buying them for online purchases. Does it make sense to try to buy at low points as their value fluctuates?
Or as a consumer (not investor) should I just buy and spend them as needed?
Holding bitcoins is speculative by definition. If you dont want to have any risk (/benefit) from currency fluctuations, you indeed should just buy and spend as needed.
MtGox website has the most "accurate" price, since they have the biggest trade volume.