I currently have a 2.33 GHz 15" MBP. I've upgraded to 3GB of RAM, a Seagate 7200RPM 500GB HDD, and Snow Leopard. Its getting taken into Apple for a new screen, super drive, and battery right before it's Apple Care ends, and when it comes back it will be in the best shape it's gonna be before it starts to wear again with no hope of free repairs. I'm done with school, and I was trying to be an architect, but due to the economy I'm an IT manager for now. At some point, I'll be back into architecture again though. My MBP served me extremely well, but lately it is getting a bit slower, and I know it doesn't truly utilize Snow Leopard because it's too old on the MBP line. With the upgrades I've done, the Good condition, and the accessories (BookEndz dock, memory stick express card, Felt case, bluetooth Mighty Mouse) I should get about $1,000 to $1,300 for it ($950 seemed to be the rock bottom price on used 2.33GHz sold on ebay, no upgrades or accessories). So now I'm Eying the 13" MBP Unibody. Reasons to get the 13" MBP Unibody Now: Spec for Spec it's either as good or better than my old 15 MBP. I'm looking at the 2.53 13" Unibody. The HDD is smaller and slower, yes, but 250GB should still be ok with me. I could always either keep my 500GB or live with the 250GB and upgrade again down the road if I need to. With the newer technology, SL should also make this computer faster than what I have. And I can get it from Apple's Refurb site for $1,300, so I may be able to upgrade for little to no $! Also, I have an iPhone now, and it's great as a portable computer that I can take everywhere. However sometimes you just need a portable laptop for certain things, and the 15" isn't too portable. Since it's not like I'm going to studio anymore, and while I do use Adobe and other intensive programs sometimes, it doesn't need to be the fastest machine around. I get by just fine now, so I figure I should get by alright on the 13". Plus the lighter and smaller laptop will make this thing way easier for me to carry around more and travel with. I have a 21" Widescreen at home when I need extra real-estate. Reasons to Wait: There's two new technologies I'm excited for. The first is the new i5 and i7 processors. I'd love to get one of these in a 13 MBP, but I don't know when they'll come (I know iMac will have them available soon) how much extra they'll be, and if the 13" will even get them (either limited to just i5 or none at all) since it's hardly treated like a 'Pro' machine. The other technology is USB 3! Man it's so fast, but I don't know when it will finally hit Apple's lineup, and when devices start to utilize USB 3, maybe I'm onto a new computer by then. Also, I really don't have much money to spend, if any, so if I can't do this on the cheap (ie Selling my old MBP for most of the cash), then it won't happen. Also the Tablet is coming! But then again, this will have to be my main computer for a while, and I doubt the Table will be able to handle that. Not to mention I can't see that much separation from my iPhone in a tablet design. Reasons to go 15" If ultimately I went the 15" route, then I'd almost certainly be waiting due to $$. The 15" should have i5s and i7s eventually, as well as USB3. I love the better video card and dual option, and that SL can use BOTH with OpenGL. Which reminds me, I know the 13" has 256 MB of DDR3 on it's vcard, but what about GPU processing power compared to the old 2.33 15" MBP? Is it better or worse overall? The real estate thing it's too big for me since I have my external monitor and I'm not running CS4 away from home like I used to in school. The better and dual videocard element really upsets me that it isn't in the 13". UPDATE: I also really dislike the glossy screen and I'm worried I wouldn't get used to it. Since I have dreams of taking this thing with me a lot more and being outside with it, this could be a problem. The 15" you can get the matte screen of course. I should also note that I'll be building my own Hackintosh probably in 6-8 months, and will have a nice screaming fast computer down the road, alleviating that duty as the workhorse from this new laptop. It will take on that role for a while though. The 2.33 15" MBP I have will also undoubtedly lose resale value the longer I wait also.