if he also hopes to experiment with software sythesisers etc,
then additional midi connectivity will be necessssary to connect
a controller keyboard to the computer..
though, an 'old fashioned' game port midi lead may be the minimum requirement if it works ok on his computer..


however, if the extra money is available..

line 6 are about ready to ship this cool looking all-in-one

recording and keyboard interface..

http://www.line6.com/toneport/kb37.html