AYF - you won't get any argument from me when it comes to SLi Many many people will try to persuade you to buy the best single card that you can afford, but I've been buying two mid-range cards and running them in Crossfire or SLi for several years now and I've never regretted that decision.
Not only is performance great, it's just cool because you can!
As for mechanical keyboards, there are lots to choose from. Corsair, Coolermaster, Razer, DAS, and even Rosewill has come out with their own too. That isn't an all inclusive list, but there are plenty to choose from. Much of your decision here will probably be based on budget, reviews and whether you want lighted keys or not.