Short answer - yes
More detailed answer: keyboard? For just singleplayer RPG games it really isn't necessary. You can have lots of fun and do all the essentials with a regular keyboard. Given that it is still ergonomic and comfortable to use. Remember wrist comfort is the most important thing with both these periphirals. I own 4 mice at the moment and only use 2 on my pc. The Razer Naga & Mamba.
Mamba only for FPS games. (It's just personal preference & I find that switching mice often increases lifespan)
So before you go and buy some keyboard that might be a waste of money, look at the Thermaltake Challenger pro (The cheap 1 around $50) Wait for a sale on Amizon or where-ever you buy from.
It is a great keyboard with very little button sound (as opposed to the razer Deathstalker)
I would highly recommend getting a comfortable mouse (do not be afraid to spend a little if you use your computer allot)
As I mentioned previously hand comfort is the most important thing in gaming, followed by eye comfort, so rest your eyes (something I haven't done in years
)
If you need suggestions look at the following brands for mice:
Thermaltake (I recommend these also if you have big hands, they are super comfortable I have used Thermaltake peripherals since 2005)
Roccat
Steelseries
Logitech (they aren't that bad I have had good experience with them)
Razer (I highly recommend these, they are very comfortable)
Avoid Alienware peripherals (especially the mouse) It is comfortable yet it's wire's fibre goes apart for no reason and it is of inferior quality compared to other mice in the same price range ($60).
For an RPG gamer I would also suggest getting a comfortable headset (if you don't have one) being aware of your surroundings helps.
Good Luck mate