Your current machine is absolutely fine. Theres no reason in getting a new one as their is no benefit to your needs (from what you have stated).
Remember, theres always new machines round the corner - are you going to sell and buy each machine every 3-4 months?
Yes, spirits are high on these boards due to the new product launches - but that doesn't mean it outdates your current system.
I have to echo these sentiments exactly, absolutely spot on.
The new machines are fantastic, granted, but having finally got round to having a look at them in person at the Glasgow store this afternoon, the 21.5" model still looks slightly "squarer" than the monster 27" model which looks like a proper widescreen television instead of a computer. The design change, from the front anyway, is very minimal.
On a performance level, I personally got this iMac in March for £612 thanks to a Corporate discount via my Father in Law's work. Getting a £949 system for £612 was a fantastic deal, and having maxed out my RAM to the 4GB this model supports, for what I need the iMac for it's still an incredibly fast system.
Apple are quite frankly the most impossible company to keep up with, and if you're someone who has a burning desire to always have the latest Apple equipment you need to have very deep pockets and an expectancy to upgrade at least twice every 12 months, sometimes more.
With computers, especially Macs, you simply buy a machine that you're going to get use out of for at
least 3 years. In that timeframe, yes new products will launch, but the machine you bought hasn't changed and nor has your requirements.
When I was a PC user almost 10 years ago now, I was very "spec" obsessed. I upgraded a lot, built my own systems, and was easily caught up in the whole GHz nonsense. Apple systems have you buying a machine as a package that you know works from day one and will continue to perform at the level it did when you opened the box whether it's 12 months or 3 years down the line. As such, you never actually think about the numbers behind the components.
I still love my iMac, it's only 7 months old, it just to happens that it's been superseded in true Apple fashion. All I'll do is buy the wireless keyboard, the new Magic Mouse (which is fantastic btw!), and the new Apple Remote to give my iMac a little makeover.
Well, if I'm being honest, my wife's been given those three items on my letter to Santa.
Seriously though, it's easy to become disillusioned with Apple if you're so inclined, but at the end of the day technology moves so bloody fast that even the machines these guys are unboxing will one day soon be the "previous" model. It happens to us all, it's important we simply enjoy what we've already worked hard to purchase.