Ok, I'm looking to make the switch but I don't know much about computers. I will be using it for e-mail/net, itunes, photo editingand word processing. ??????What I'm confused about is.??????? 1-What makes the computer fast ? obviuosly the processor but what I mean is, would a ibook 1ghz with 1GB ram be faster than a pb 1.5 with 512MB ? All i hear is (you won't notice the processor speed but make sure you have enough ram! ) Is there a noticable difference between the 1.33 and 1.5 PB???? 2-How do G4 compare to Pentuim 4 (speedwise) I see that P4 are up to 3.5 and PB only have a 1.5, are they that much slower or do they not compare? what speed pentium be compairable to a PB 1.33 3- Would I and how, notice the difference between the ati 9200 -32m, or the nvida And ati 64m or just upgrade the whole thing to the 128 ati video card? 4) Will I notice the difference between the 4200 rpm and the 52 rpm hard drives?? I've heard the 42 uses less power but is it noticable slower? 5)Last, The Combo Vs Super CAN I OR CAN'T I.... Use idvd with an external burner????? I can buy a faster burner for less money and save on my laptop. But from what i hear, the software iDVD is great for editing and I'd want to be able to use it and make dvds. Hopfully my questions make sense!!! I've been going back and forth for weeks!!!!!!