Personally I am a believer in "you get what you pay for".

Unless you are new or really inexperienced, there isn't really a reason why you should charge under about $200 (guesstimate).

Under charging not only hurts yourself but hurts the industry as well.

Personally, I voted '$300 < $XXX'. This might seem high but there are many firms out there that charge way more.

Be confident and always do the best to charge what you are worth.