Opera - description from Softdepia.com:
Thank you for choosing Opera
Opera is the fastest, most user-friendly and flexible Web browser on the market.
You have chosen to buy Opera 5.0 for Mac 7.5.3-9.2 and OS X Beta 4
Buy Opera to:
Remove the ad banner and enjoy a larger browsing window area
Receive priority technical support
Support Opera and a free World Wide Web open and accessible to all
The current full price for Opera is 39 USD. For information discounts for students, upgrades, or volume purchases, please visit www.opera.com/order/pricing.html. Users who have registered and paid for Opera 5 can upgrade to Opera 6 for free.
Opera is a "Free to try" program. You can download and try it for an evaluation period.