Panasonic TXP50GT30 or TXP50ST30 value for money?

Hello,

Was just wondering which TV would be best in terms of value for money:-

1. Panasonic TXP50GT30

or

2. Panasonic TXP50ST30

I know the GT30 is better, but it is also a feww hundred pounds more expensive, so is there that much difference to justify the price? WhatHifi gives the ST30 a good review, though I'm not sure if this is because it is great for a budget TV or because it is great despite its small price.

Thanks