just from reading threads on here the new tekin esc seems like the latest and greatest.
I'm using the novak hv system and have the 6.5 motor in my buggy right now. I'm happy with how well it works, it has smooth power delivery but the esc takes up lots of space which makes it harder to install.
The HV esc doesn't have alot of features to play around with, but if you have a good radio its not much of a problem.
like rearviewmirror said its best to check out the other threads and see what other people are using then check out the maufacturers websites.
Current active RC's; Brushless Xray XB8, CRC Pro10, Tamiya M03, Xray M18, Losi Micro-T. Inactive list; Losi XXX-S, Duratrax Evader st, Traxxas TRX-1, Traxxas E-maxx, Brushless Ofna 9.5, Corally sp12m