After using this forum and reading many reviews and according to my budget and place, i narrowed my choices into these:

1) SAMSUNG LE40 A650
2) SONY KDL40 W4000
3) TOSHIBA REGZA ZF355
4) PANASONIC TH42 PY70F (equivalent with PZ70).

Any of you guys has anyone of these or strongly recommend any of above??

The Panasonic or Sony are best in my opinion

Seconded.

toshiba would be my choice , however , how about posting up the prices you are looking to pay for the different tv's , it may be interesting

I ll not say exactly the prices, because in my country are kind of different than USA, but...
Toshiba has the lowest price, while SONY and Samsung the highest. But both of them are in close range of price.

you do know this is a United Kingdom based forum dont you ???

!! Really?? Im not english, i didnt see its UK forum !

So, some likes toshiba, some sony, some panasonic.
This model of Panasonic is it really good or better get sony or toshiba LCD that is very good.

What about Samsung A650??

a lot of it is down to personal choice and how good you percieve the quality / features to be , i would stay clear of samsung , others will say they are good

I agree - the Panasonic may possibly have the edge on the Sony but both of them are good TVs and you should go out and see both then make the decision based upon your preferance.

and then i am more than happy with my 42x3030 toshiba

If you do decide that the Sony is right for you, you can pick up the Sony Bravia KDL-40W4000 Electro Saver £794.99

You may also find this review from HDTV useful in deciding if its what you are looking for.