This is the 5400+ Black Edition: http://www.newegg.com/Product/Product.aspx?Item=N82E16819103289
It has an unlocked multiplier. In other words, you don't have to raise the HT clock to OC the CPU, just raise the multiplier. The Brisbanes overclock very well.
I don't personally own the Xigmatek HDT. I took Rooster's advice and tried the one I have (sig). Haven't tried OCing yet. Don't wanna void the warranty and I don't need the extra power right now.