Hey Mr. May . . . as the
Rana is just a
Propus with a disabled core there is a chance it can be unlocked* . . . . looking at the Anandtech chart above in post
#6 I don't see any "compromise" to buying a TripleCore vs a QuadCore for gaming unless your one of these types that like to encode a video while you game!
£15-£30 saved on the processor is £15-£30 that can be spent elsewhere . . you could put that towards a newer chip out in 9 months or just pocket it! . . . I would say overclocking a TripleCore is gonna be easier, cooler running chip and PWMs and some power saved by not fuelling an extra overclocked core that "may" not be adding a whole lot? . . . makes sense to me anyway!
If somebody has a motherboard with the
SB710/SB750/SB850 Southbridge then it's a tricky but "fun" choice working out what chips right for you . . . . Kudos to AMD for giving us a reasonably open platform that lets us pop in & out chips . . I'm having no performance issues with a
Rana @ 3.6GHz and if I ever do it's really not a problem for me personally to pop out the chip and plug in a new one (and then flog the older one) . . . I'm starting to think that any money shaved off the processor cost should be put towards a slightly more "beefier" AM3 motherboard!
Slowly (but surely) we are
moving away from Dual/Quad arena (2006-2010) and
replacing it with Tri/Hex . . . any money saved on an AM3 purchase today is also money towards one of the "many" enticing AM3 chips lurking in the near future!

. . . . keep your money in your pocket guys, make them work "really" hard before you cave in! . . . in the meantime the
100% guaranteed TripleCore Rana can be had for £55 and makes an excellent AM3 start-up chip!
[edit]
for the people with older boards that haven't got the required SouthBridge for unlocking then the
AMD® Athlon™ II offers the most affordable route to the MultiCore Market . . although overclocking these "fixed" multi chips is an easier task for someone with overclocking experience compared to a novice . . . For people with only basic overclocking know how then the
Deneb Black Edition chips do make it easier with their "open" CPU Multiplier . . . these are the chips I personally think are very "compelling" for anyone looking for "maximum" value for money . . .
- AMD® Athlon™ II TripleCore (425/435) £50-£60 (Quad unlock Gamble*)
- AMD® Phenom™ II DualCore (550/555) £70-£80 (Triple/Quad unlock Gamble*)
- AMD® Athlon™ II QuadCore (620/630) £70-£80
* Requires suitable SB710/SB750/SB850 enabled chipset and a little luck