I have a Nespresso,
Citix by Magimix, and really like it - do get the Aerocino though too as the warm frothy milk is part of the experience (if you like milk). Nespresso aren't cheap but much less expensive than buying coffee 'out' and the capsules are between 27 and 31p each (sold in sleeves of 10). The capsules are sold by Nespresso only but don't be tempted to buy from eBay, some sellers buy cheap and sell at daft prices way above Nespresso direct.
I opted for this type of system as I can't really be bothered with the bean to cup option or the steam milk heater. I wanted a more instant response and my machine is as easy as using the kettle! The kids use the milk heater for hot chocolate too :)
I prefer the stronger coffees and genuinely think coffee at home is actually better than I can get at Costa, Starbucks etc. Mind you Starbucks have recently launched their own coffee machine,
Verismo, selling their blends of coffee in pods - might be worth a look if that's your poison. Pricey though...
PS if you are thinking of a Nespresso machine, check for special prices and cash back offers - John Lewis are pretty good too if you want a look/try/taste as they often have a demonstration stand. Handy for a coffee hit!!