Firefox is definitely the way to go. It's getting more popular and is close to 10% of the browser market now. Trouble is if it ever becomes even close to 30-40% of the market then spyware makers will really start to aim at it. That's the real reason it's more secure - it's being used by too few people to really attract the bad guys yet.
If I could only get rid of all this maintenance.
www.diyjunction.com