My system discs were stolen when my house was broken into for the second time. 

If I ever need to reformat the HD, will the OS I buy at a store give me back all the goodies that came with the laptop (ilife and yadda yadda)
Also, I recently got a 4 gig RAM upgrade from Crucial and Im not really noticing any performance difference. Ive got a tone of stuff on itunes and it seems to load just as long as it did before. I also have Photoshop CS4 and I dont see any changes there either. Ive got 121 gigs free on the HD, everything is updated and I have run the disc utility since the upgrade. Anything else I can do for it? Do any of you run any 3rd party system utilites or virus scanners?
Thanks for the input
DnBfiend
Also, I recently got a 4 gig RAM upgrade from Crucial and Im not really noticing any performance difference. Ive got a tone of stuff on itunes and it seems to load just as long as it did before. I also have Photoshop CS4 and I dont see any changes there either. Ive got 121 gigs free on the HD, everything is updated and I have run the disc utility since the upgrade. Anything else I can do for it? Do any of you run any 3rd party system utilites or virus scanners?
Thanks for the input
DnBfiend