My recommendation for ease of use and fast turnaround is Geotrust or one of their resellers.
If the requirement for "virtually all browsers" includes esoteric mobile stuff I'd be concerned about intermediate certificate authorities. If you're doing desktop applications/common mobile applications, these providers will have solutions for you.
Thus my antipathy to GoDaddy; they made $15 bucks off that merchant, but I will recommend against them, because it's pretty sleazy to play that kind of game on people.
Considering they are 1/2 the price of instantssl.com, I'd say they're a fine option–especially if you're bootstrapping.
I should also mention that they have the lowest wildcard certificate I can find.
A few of my SaaS apps require this because they're subdomain-based. $200 is still a lot for a wildcard cert, but less than $379