for windows 7 32 gb is enough on my 60gb ssd with media portal installed i still have 48gb free.
that said i havnt seen the 32 gb ssd's for that much less then the 60 gb ones. i got the ocz vertex plus 60 gb for 39.99+shipping(9.99) after a mail in rebate (that has been accepted just waiting for it in the mail)
an aftermarket fan is a great idea. definitely can reduce the noise. i think the main one everyone recommends is the hyper 120 but i wouldnt buy it untill after you build the pc. see if you even notice the fan noise first. i personaly find the fan in my powersupply to be louder then my cpu fan lol