I hear and understand the points you're all making and, please, believe me when I say that my natural instinct is to always buy the best equipment possible but, in this case, I believe the paradigm is changing.
The argument that buying the best adds to the life of your machine on the back-end made sense in the past because an extra 20% would get you some serious extra fire-power - a top-notch video card at the very least. Now, however, we're are looking at a fractional improvement when we already know, from Intel's CPU and motherboard road-maps, that improvements in the near future will dwarf those gains. Do you really believe that, even in just a years time, any potential buyer will notice the difference between 2.2 and 2.4? And in 2, 3 years time?
As for the video memory - bear in mind that we are talking about exactly the same GPU, running at the same speed but with 256mb of memory rather than 128mb. Sure, 128 isn't much but I believe it will do reasonably well with current games unless you plan to screen them on massive external monitors. If you are shooting for game nirvana, frankly, 256 is going to fall pretty far short too.
To anyone with a tendency towards buyers remorse: get over it! My bet is that most of you fretting over frames per second probably aren't going to have as much time as you think to play games. Those of you who are hardcore gamers are going to be dis-satisfied anyway when Apple releases a 512mb version in the Autumn.
So, what I mean by a changed paradigm: for the first time, the relative value of money is lowering (we all generally have more money to hand and, certainly, can more easily borrow money) while the cost of "high-end" laptops is plummeting. Over the last few years, Apple has clearly had problems making a case for the high cost of it's MBPs over it's regular MacBooks; the main differentiator has been that the MBPs had an actual video card. Now, however, especially following the decision to make all MBPs 2GB as standard, the main problem is differentiating the base 15" MBP from the "high-end" version - take away the HDD difference (which you can upgrade for a mere £50) and all you've got left is a puny .02 CPU jump, 128mb of video DRAM and a £200 gap. Ridiculous.
If you look closely, you'll also notice that the high-end (black) Macbook is also a very weak proposition compared to the base MBP. I don't know what Apple are doing here but I suspect they are try to give all those potential Macbook buyers an easy ramp into buying MBPs instead. They are willing to create a bargain-priced MBP because they know that the hardcore fanbois will buy the high-end version at a premium price no matter what they do.
So, what we've now got is a situation in which you can buy a marginally less powerful machine (and, really, apart from graphically-intensive games, I don't think it's power the vast majority of users would ever use anyway) at a far lower price, making it feasible for users to upgrade far more often.
Remember, we are in the age of ebay, when buyers seem eager to pay far too much for second-hand laptops. I have watched recent auctions closely and am astonished at how close to retail prices the winning bids have been, even for pretty old Macbooks. I knew that Macs held their value well but, damn, that is just ridiculous.
Those of you who are talking about holding onto your machines for 3 or 4 years are insane. As long as you back-up up anyway, moving to a new machine is easy and, now, cheap. I believe that, if you wisely buy the "bargain" MBP now, you will be able to sell it in a years time at very little loss and be able to pick up the much better "bargain" MBP that's available then. It's like cars: all the smart folks keep trading in because, for a nominal premium, you get to always have a new car that, as a bonus, is always under warranty. Always having a new computer makes even more sense.