30. Don't have one yet, but definitely want one. $360 is a bit much for my grad student budget. Will just hoard my Amazon visa rewards for a while and wait for a price drop. Plus I finish the Ph D and start an Asst. Professor gig in the fall so I'll have more funds then.
Also, being a researcher....you need to make the poll options mutually exlusive!
As it is you have ages listed twice. i.e. 25-30, 30-35 (so 30 is in 2 categories).