Looking at replacing my desktop

I've been considering getting a laptop for 2 whole days now, hopefully you folks can help me out deciding if i need one or not.

1_What is your budget? hm, say £400. I'm not sure what the price range on lappies is these days.

2_How much screen do you need? Fairly large screen. I'm used to a 21" lcd, which I guess isn't out of the question of linking up to the laptop if i need to. >12"

3_How much screen resolution do you want? I like smallness, upwards of 1152 x 864

4_Do you need a portable or desktop replacement laptop? Desktop replacement. I need to save some space that this current beast takes up

5_How much battery life do you need? Not really an issue, will probably just run it off power. Maybe 20hours? Not sure, enough to do some wireless activities or watch a film

6_Do you want to play games with it? If so then what kind of settings you want to play your games?(Low,Medium or High)? Yea, at first I was just gonna give up. But TF2 is awesome for a blast every now and again. I'd like to still be able to handle some of the intense firefights. WIth the source engine thought I know its heavy on the processor over the graphics card.

7_What other tasks do you want to with your laptop? Watch films, play music, maybe some digital editing every now and again (nothing intense)

8_How much storage(H.D.D Capacity)do you need? Hm, 250gig?

9_If you just want to buy from some sites that you like,please post the link of them. Not an issue

10_How long do you want to keep your laptop? 2-3 years

Thanks in advance for your replies.

HP has a solution that runs up to 24 hours but it costs around oh, I don't know $1300 or so to get a configuration that runs that long

In that Price range the HP G6000 series are one of the nicer machines to use on a day-to-day basis. They are only (usally) AMD Turion X2s, but they aren't too bad TBH. I'm typing on mine at the moment. They don't have ExpressCard slots, or card readers, but they do the basics. Screen res goes up to 1280x800(Though that's true of any 15.2" lappy in your price range). Battey life is about 2 hours. Retail cost of them most places is £399.99.

You'll not usually get a "real" DTR any place for under about £600.

Thats for the replies guys. I don't really have a clue about latops as you may have gathered. Battery Life isn't explicit, but 4 hours would be good so it doesnt get arsey if i watch a film or something.
I could extend my budget as well, but basically I want to be paying less than £800 or I'd just build myself a new pc.

Personally I would look at ebuyer.

Something like This might suit. One of the guys I work with has the smaller screen version, and it's a nice looking, and well finished machine.