If you're looking for power in a single bey, I think Archer Hercules still tops the stock combo power charts despite 13 being weak. It's a tough stock combo to outspin or KO, although aH is starting to get more counters as time goes by.
Cho-Z Achilles is pretty good due to its solid offensive layer and disk, although its driver is weak. You'd need a better Attack driver to make good use out of this, although this also comes with a really great launcher.
I haven't gotten Dead Phoenix yet (it's still in the mail), but it seems like if you're gonna get Dead Phoenix you'd be best getting Revive Phoenix as well. Revive Phoenix's core makes Dead Phoenix's armor stronger, both 0 and 10 are excellent disks, and Atomic is amazing as well. Both of these together merge into a powerful Defense/Stamina combo easily and is well worth getting both together. Revive Phoenix also comes with a fairly long ripcord launcher that's better than average.
Shadow Amaterios (sometimes called "Yamiterios") also has 0, and the Xtreme' driver it comes with is nearly a necessity to make all-out Attack work out. The layer is pretty, but mediocre.
Bloody Longinus is probably the weakest single stock combo I'd suggest, if only because Jolt is passable for Attack and bL is pretty handy in trying to beat down Hell Salamander combos, especially if they get greedy and use Bearing. 13 is once again weak though.
Anything else decent is usually paired up with fairly poor parts (e.g. Cho-Z Valkyrie and Hell Salamander, both strong layers on their own but with a weak disk and driver) or are hard to obtain (mostly random booster combos like Dead Hades. 11 is weak, but everything else is passable or excellent on it, although getting a guaranteed dH is going to cost a bit)
Cincinnati-based Organizer, and owner of every single currently released TT Burst bey part in at least one color. Hard to think of anything I don't have from MFB either...
