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Big commercial style ones (£1000 ish) are good, but they need to be used nearly constantly otherwise the coffee can taste a bit metallic.
Kitchenaid do an awesome home one for about three hundred quid.
The most important thing is: grind fresh beans for each use.
Personally, I've got one of those little Italian (Piagio) espresso makers that sits on the hob. Makes decent coffee (not quite so strong as a machine), easy to clean and cost me about £20.
I have a built in coffee machine in my kitchen similar to what you see in proper coffee shops.
Grind the beans into the scoop, hook it on and press the button to put pressurised water through (the pressure matters).
Try here, though other appliance sites are available, this is just from a quick google. http://www.247appliances.co.uk/products.asp?c=26