Pinning down the iMac and who it's aimed at will always be a difficult job, seeing how effortlessly it doubles as both all-round entertainment centre and ultra-competent office workstation.

You get everything for your cash: a powerful, well-organised desktop, a bright wide-aspect display and a reasonably easy- to-swallow price. Despite not having the depth of power of a Mac Pro, or the keen price-point of a Mac mini, the iMac will gracefully perform most tasks you set it, at home and at work.

So the recent revamping of the iMac range certainly caught our attention. Now the family boasts four new siblings: two 17-inchers, one 20-inch and one jumbo 24-inch behemoth. The upgrades are in many ways expected, particularly the upgrade from Intel Core Duo to the more efficient Intel Core 2 Duo chips.

But features we haven't seen on recent iMacs also make a welcome appearance. At last, Apple has allowed a degree of flexibility in its configuration options. You can now choose between different processor speeds when you buy and upgrade to 2.33GHz chips on three of the four machines.

On all but the lowest priced 17-inch iMac, Bluetooth connectivity comes as standard, and you can configure graphics cards, expand hard drive capacity and bolster RAM to 3GB. Alongside the processors, the L2 cache memory has been doubled to 4MB, too - this alone is the biggest contributor to the new iMacs more responsive feel.

24 inches of pleasure

But the real surprise in the new line-up is the whopping 24-inch display that comes with the top-end iMac. This machine comes with either 2.16GHz or 2.33GHz chips, a speedy NVIDIA graphics card options, and a FireWire 800 port for fast data transfer.

That's all for the good, but the large display is, frankly, OTT. Up close, the sheer space can be daunting when you're just checking email or surfing around. But for photos and movie editing, it's ideal.

Of course, its prime purpose is for movie playback, and the timing of this Mac's release with the recent unveiling of iTunes' movie-download facilities, is surely no coincidence. Using the Apple Remote and Front Row on this jumbo display is simply fantastic.

When Apple's iTV box launches next year, and iTunes video content outside the US improves, this huge display will really come into its own as part of the household entertainment centre.