TONS of options out there.
I am personally using [BUILD][06.12.10]-=MDJ FroYo HD v.4.4=-[kernel:MDJ S7.6HD] - xda-developers
Everything I have read states that m-deejay has some of the best and most stable Android ROM's out there.
I would 100% suggest you use: Jmz Android Dual-Boot for HD2 v5 --- 05NOV10 - xda-developers
Well worth the $0.99 for the app.
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(otherwise the mean android ghost will come and underclock and overvolt your phone!!)