I'm using a Lycosa with an Abyssus (got both for $50, brand new) and I love both. But a mechanical keyboard lasts longer but makes a loud clicking noise. Hense, why I don't go with mechanical keyboards because it feels a bit different. Instead, I prefer to spend money on a keyboard such as the Lycosa but don't go with the Abyssus, go for the Deathadder instead. Try out that and a G500 to see what fits your hand even better. If you need something for MMO's then an MMO mouse or a Nostromo would do you just fine depending on the size of your hands.
I'm a PC gamer and I don't go by with one company. Instead, I go with multiple companies with multiple gear for different playing styles and genres of video games. Why? Because I love FPS but I also love my MOBA, MMO, RPG, Racing, and just plain action and stealth games. If your going to do FPS 90% of the time then you should choose your weapons carefully. And remember, weapons don't make you better. It improves your skills, it's your weapon for your hands to hold to do better.
I don't listen to people who say Razer sucks or anything. Razer has good weapons for my hands, and it fits me. So does Logitech, Rocketfish, Cooler Master, and Corsair. But I love my Razer and Logitech gear. Razer mouses actually fits my hands more than Logitech, believe it or not, so I go with Razer when the mouse is good and at a good price. It's your weapon, they have tons of it. Don't go for the hype, do what I do. Go for what feels right in your hands and what you enjoy about that weapon. Happy gaming man. =3