There are so many keyboards out there, the vast majority will work just by plugging them in - I bought a Logitech MK260 Wireless Desktop, which is a wireless keyboard and optical mouse, from Amazon.
Just plug in and go - it works a treat with my RPi.
I need a smaller telly though, the text is way too small on my 32" TV when connected via the HDMI.
It cost £17.98 (just put B004MEXYLM into the Amazon search)
My £0.02 worth.
My signature is broken - my favourite Albert Einsten quotation is 307 characters long, so doesn't fit in the 255 character limit....
“You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is m<SNAP>