I find that 1366x768 is a big step backwards. Think about it - several years ago (around 2002?) 15" TFTs were becoming the standard with 1024x768 as the screen resolution then that eventually went on to 1280x1024. These new 1366x768 resolutions are wider than they were 8yrs ago but it's the same height!!!
This is a personal opinion, mind you, so if you prefer wider to overall bigger, feel free. There are quite a few people at my workplace that prefer the slightly wider screen res for that extra column or two on their spreadsheets.
I would've gone the extra £10-20 for a screen resolution of... well, just bigger.