Long story short: I currently have a 20" iMac G5, practically maxed out. (only thing that isn't is ram; got 2x512mb dual-channel) I have now had my third hardware fault surface, and from what I've been told, after three faults you are entitled to a replacement system, or you can pay more to get "upgraded" to a different one. (A friends' 12" iBook just died on him completely, and he's paying £200 to get upgraded to a 12" powerbook instead) The iMac G5 is my first Mac, and I've loved using it, but I had initially planned on buying a Powerbook before the iMac G5 was announced. I'm comparing the two systems, and both have good and bad sides: Processor: 1.80GHz G5 600MHz FSB 1.67GHz G4 167MHz FSB Memory: 1024mb PC3200 400MHz (dual-channel) 1024mb PC2700 333MHz Display: 20 Widescreen TFT 1680x1050 17 Widescreen TFT 1440x900 Graphics: 64mb nVidia GeForce FX 5200 AGP 8X Mini VGA Out (mirroring only; without hack) 128mb ATi Radeon 9700 mobility AGP 4X Dual-Link DVI, S-Video (dual-displays) Hard Drive: 250gb S-ATA 7,200rpm 100gb ATA100 5,400rpm Optical Drive: 4x Slot-Loading SuperDrive 8x Slot-Loading SuperDrive Ports: 2x Firewire 400, 3x USB2.0 1x Firewire 400, 1x Firewire 800, 2x USB2.0, 1x PC Card/CardBus Networking: 10/100BASE-T Ethernet, 56k v.92 Modem 10/100/1000BASE-T Ethernet, 56k v.92 Modem Wireless: Airport Extreme, Bluetooth Airport Extreme, Bluetooth 2.0+EDR Audio: Headphone/Optical Output w/12 watt digital amp, Line-In Headphone/Optical Output, Line-In/Optical Input Inputs: Bluetooth Keyboard/Mouse Backlit Keyboard, Trackpad Other: iMac + No cost - More limited expansion Powerbook + Portable + Noise level + More expandable (firewire 800, dual display etc) -£300 extra I'm having a hard time deciding which to go for. Although I've heard that G4s are faster than G5s at the same clockspeed, and while they're similar, I get the feeling that FSB will be killing whatever advantage they have. I do a fair bit of Photoshop work, and find my iMac a bit slow for it at times; will this be significantly slower on the Powerbook? I also find even things like using Firefox for browsing, or some videos (wmv mainly) can be sluggish at times. The system will primarily be used as a desktop (hence the 17" powerbook) but it would be nice to have the option of taking it with me somewhere. Although to be fair, I can't actually think of a situation where I'd use it elsewhere right now, other than perhaps around the house, and I'm happy in my room. Noise level is something that irritates me with the iMac; I always run it at highest cpu (it seems some apps don't tell it to speed up when needed) so I'm sure that contributes, but I find it a bit sluggish otherwise. I would presume the powerbook is much quieter as it's a G4, and a laptop. Going down to 17" after using 20" might be hard; it certainly won't have that "wow" factor that the iMac has. However, unlike the iMac, it has proper dual-screen support, so in 3/4 months time I will be considering adding a 20" apple cinema display. (I would be considering it for the iMac too) How do the screens compare in quality? I love how bright and vibrant the screen on this iMac is; is the Powerbook the same, only a smaller size? The better graphics card, and lower resolution on the Powerbook are a good plus too; I've often found that when I have a lot of windows open (or 2/3 of the iLife apps) exposé animations drop frames quite a lot on the iMac, and it really bugs me. Does anyone with experience of both (perhaps the older 1.5GHz Powerbook) have anything they can add? I like the idea of being able to just unplug my system and take it with me if I need to, although a 17" might be a bit big to use on-the-go. (but I couldn't deal with a 15" unless I had a main display for when I'm home, and I can't afford that right now) I don't like that there's going to be a lot more visible wires with it though; you can't see any with my iMac. So what do you think? I'm leaning towards the Powerbook right now, but it's probably influenced by the fact that it's a new product.