Love my 720x3 BE
I bought a Phenom II (2.8x3) 720 BE last year and have not been disappointed whatsoever. My system is at a benchmark comparison with i7 rigs that cost twice, if not three times the amount as my system as it stands (720x3 BE, 4gigs of dual channel 1600RAM (6-6-6-20-t1) and two 4870s). In addition, my BE is overclocked to a blistering 3.4ghz, on passive cooling within an Antec 900 case, and never peaks above 41degC.
I spent £120 on that chip, and compared with the generation equivalent quad core Intel chips it is cheaper, has much more leeway for OCing and in my opinion is a much better choice for budding overclockers working on a budget.