While a improvement can be had with a better mouse (of course) keyboards are all basically 'the same'. The difference is a personal 'feel' to them. Some people do better with 'clicking' keys, some like the 'spongy' feel, some need LARGE Ergo bent ones because of the size of their hands, and so on. I would suggest first and foremost go to a couple 'big box stores' like Staples, Fry's Electronics, Best Buy, etc. and go to the keyboard and mouse aisle (will talk mouse in a second) and place your hands on the keyboard, also on the 'desktop' display models too. Feel the way the boards are arranged, the size of the keys, the wrist guard, and so on. When you feel one more comfy (like shoes) then another, then stick with that 'type' (doesn't matter yet on the maker) you can read on the packaging the features your finding to your needs.
Now that works for your left hand movements, and should be alot more helpful when hitting the keys. YOU DO NEED TO REMEMBER it is NOT button smashing like on a console. PC is more precise and the quicker you get used to Single Player shooting on how you can duck and shoot with only two key hits the more likely you can duck and shoot when in Multiplayer.
As for mice, this is a totally different animal and let me explain two keys that make 'them better then me'. 1) DPI 2) Macro-Button assignment.
DPI is the speedy reply of the laser to hitting the 'surface' your playing on and back to the sensor to determine if the mouse moved, and what way it moved. The higher the DPI the larger the response is on the screen. for example just nudge with a 600DPI 'common cheap mouse' will move the arrow just a little, a 2400DPI common gamer's mouse will 'fly' across the screen. The more response the more 'precise' you can get as PC gaming success is based on WHICH PIXEL you hit, not that (like in consoles) you shoot in a 'area' of pixels. So a higher response mouse really helps get those head shots or seemingly impossible 'between the two steel beam' shots.
Macro-Button assignment is the BIG decider in many instances especially when twitching (Call of Duty most famous). Typical out of the box playing is 'mapped' Left Button Shoot, Right Button Scope and that is about it, but never map the center 'wheel', much less the typical Gamer Mouse having Forward and Back (for web pages) thumb buttons, or more (5-8 buttons total) to map all sorts of things to. For example as Back is closer to your thumb mapping 'Knife' so you can 'twitch' those nice knife attacks, but 'Forward' maybe 'grenade' since you have to slide your thumb forward, giving you less likely to 'twitch' a nade and mess up then to 'think' to throw one quickly. Combinations of commands were (usually blocked now but you never know) 'binded' on a keyboard key or mouse button, so for example the infamous 'jump - toss nade - crouch' combo would be binded into one keypress that would see the person jump tossing a nade then landing into a crouch firing his gun usually catching the persons running from the grenade in a hail of bullets long enough for the nade to make a Multi-kill.
As you can see on the PC side one can have a edge through any number of ways, where as console is locked hardware, there is no difference from Bob's PS3 as compared to Megan's PS3, but Bob's Staples bought logitech mouse and keyboard doesn't allow him to do all those thing Meg's Razor Gaming Keyboard and mouse can. This also isn't limited to the difference a screen (I run at 120Hz so I can see more detail with a 3ms response time) can have to your playing, nor the video card can output, or how slow it is your Hard Drive is running (SSD helps so much on 'load screens' to get me int he game much faster) and so on. Gaming is expensive investment on the PC but can give it the edge you need (I need the 120Hz screen because I am 'old').
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