I have been going through the same question for the last month too. I have a 15" T60p with 16:10 aspect ratio so I had to stop crying for 4:3 a long time ago (

). I moved the taskbar to the right and I can live with it as is ...
T510 and W510 were the logical next step (since they have the I7 processors and most of the latest options) but, to me, going to 16:9 is accepting another defeat. I need the vertical real estate and since this is supposed to be a business machine (and I do use it for work) it boggles the mind that watching 1080p movies on your laptop is the driving goal. Plus I think FHD is getting too small of a font a 15" or 14".
So for me, since I wanted to stay at 15", next option was W500. Despite having the Core 2 Duo processors at least it kept the 16:10 aspect. However as you can see on their website they do not ship in less than 4 weeks (and I read on other forums that people that ordered them, as well as FHD laptops, have been getting a lot of delays in delivery).
So I find myself in the odd position of considering the W701

since it keeps the 16:10 aspect and has the latest processors. Or look at other brands (Sony Vaio F is 16:9 but has a 16.4" screen so that gives you a little better viewing screen). I will wait until beginning of April to see if they do release it (I think it was supposed to be out already by now). For now I have bought more RAM for my T60p and a new HDD (could not bring myself to buy a SSD for it).
Keep us posted on your conclusions.