Plasma vs LCD really depends on the model. LCD is sharper BUT Plasma can give the effect of a nicer looking picture as it generally can show better blacks and is better at fast moving scenes (LCD can show up any picture inconsistences) due to the ever so slight smoothing of the pixels. This rule however doesnt apply all the time and is just a generalisation of average reviews. I think you'd be hard pushed to claim one the true winner. You wont lose whichever you go for. Check reviews for this TV and then decide whether it's for you. Both have their merits and it's a very close call on a good quality screen.
I found this on the www.greenandeasy.co.uk website which claims that LCD is more efficient:
If you are planning to purchase a new LCD or Plasma television, choosing an LCD model will be up to 35% more energy efficient for any given screen size than its plasma equivalent. LCD televisions use fluorescent backlighting to produce images and they require substantially less power to operate than plasma screens which use a lot of electricity to light each individual pixel you see on a screen - even the dark ones.
PM Gordon Brown announced the intention to set up a voluntary energy labelling scheme for Televisions (and DVD's etc), similar to the schemes in place for other domestic appliances. No dates for it's implementation are yet available, but the Government funded Energy Savings Trust have been asked to work with manufacturers and retaillers on the scheme.
An immediate way of reducing energy consumption is to turn equipment fully off when not in use rather than leaving it on standby - it is estimated by the Energy Savings Trust that TV's left on stand-by waste £88m worth of energy annually and set-top boxes another £11m.
Sharp’s is currently leading the field in environmentally friendly televisions with its' recently announces ‘GA9E Series’ LCD TV range which have been awarded the coveted ‘EU Ecolabel' for their low energy consumption and contribution to reducing carbon dioxide emissions (CO2). Sharps commitment extends beyond the development of ‘green’ products, that lower the burden on the environment, to its own manufacturing processes, through its award-winning 'Super-Green Factory' Policy.