Thats a tad overdramatic people, phenom 2 platform = bulldozer platform.
Bulldozer availability and pricing might not be great in the first days, it might be great. No harm in building the cheapest phenom 2 setup you can buy, maybe a second hand duallie that unlocks or something, and switching out the CPU a couple months later.
Phenom quad cores aren't awful anyway and more than enough for gaming, are they the best, not close, will they get spanked in gaming at your gpu limits over a Bulldozer or i7/i5, not in the slightest, are they stupidly cheap, yup.
If he's desparate, going a cheap AM3/am3+, would leave it easily upgradable to Bulldozer.
You could get a phenom 2 £90 quad core setup to last you a little longer, skip the first incarnation of Bulldozer and move right onto the second version.
Who knows, theres lots of options, an i3 to tide you over in the same way wouldn't be a bad option, due to i3's significant IPC advantage in anything dual threaded it can be way ahead of a Phenom 2, in anything that can use 4 threads a Phenom 2 for the same price spanks an i3, a 2500k is a fantastic chip, but you're moving into a higher price bracket.
Basically GTO, how urgent is it, and how much can you spend, because price is just about the biggest factor in what ends up best.
http://www.anandtech.com/show/4083/...core-i7-2600k-i5-2500k-core-i3-2100-tested/17
pretty much highlights it, talking about £90 chips, single threaded, i3, multithreaded Phenom 2 is still pretty much the best option performance wise and generally cheaper mobo's for the same functionality. At £150 you have the 2500k vs a hex core Phenom 2, and here really you'd want to go 2500k most of the time, however a hexcore would give you the am3+ platform and a route to bulldozer chips over the next year or two.
Personally I wouldn't buy till after the bulldozer's are out, it will offer more performance/£ across the AMD range as Phenom 2 prices get cut, Bulldozer is added in and potentially 2500k price cuts if Bulldozer beats it. Right now if you had to buy, its ALL down to what you can afford.