[que frustrated tirade]
Actually - how about NOT going in to your local store, wasting their time and resources knowing you're going to buy online anyway. If you shop online for a product, you're doing so because it either is perceived as cheap or perhaps truly is. The biggest ways you get cheap is to completely eliminate personal service, any ability to touch/feel a physical product, professional (usually local) back end support, and an ongoing relationship with your shop that will most likely take great care of you with other future needs well beyond the single item you may be looking at now.
If you shop online looking for a deal, understand why you are getting for that price, but understand more importantly what you are NOT getting. Accept it, and please do not bother your local shops who are doing all they can to survive with an online window shop before you make your purchase. [/tirade] :)
There. I feel a little better now. But seriously, there are plenty of places to purchase goods in good old fashioned brick and mortar stores, and some may offer the convenience of online sales. But no good comes of using business A for 'research' and purposefully choosing internet vendor B to spend your money. Business A won't be there for you next time if too many people take that approach.
To address the OP's question, as this was back in May when posted, I'm assuming you've made a choice by now. The Oakely Fire Irridium lens shows a VLT of about 8% - which is quite dark, and might not be suitable for anything but direct, bright sun on the bluest of bluebird days. It looks to have a warm cast to the base tint which affords a slight advantage over a grey base tint in variable light.
Ultimately, you'll want to try the goggles on in person, verify both fit and function between lenses, and make the choice that feels right for you. In reality, goggles, and even more so goggle lenses are extremely inexpensive when compared against the rest of our downhill obsession's equipment. Don't be afraid to purchase several lenses for your preferred frame style, and use what you feel is most comfortable for you!