I'd be cool if it was just a one time purchase. Subscription fees are more than I can handle I'm afraid
Subscription is for trading capability through the site, for continued support, for the awesome charts, etc. It will not be too much and will be payable in BTC.
This thread is well-timed!
I am using this
http://www.iqfeed.net/ for historical and real-time data for futures and forex. I pay about $120 per month.
It would be cool if they or any other data vendor started supporting BTC data feeds from at least mt.gox (other exchanges are welcome).
I could pay $3-5 USD per month to get a quality feed and hook it to my frontend.
Noted

What front end are you using, btw?