You might want to stay away from the higher rated batteries at the momment (even 2500mah is pushing it). There have been no new breakthroughs in NiMH chemical technology, and no recent improvements in the manufacturing process. All recent capacity increases also come with the addition of increased internal resistance. It is market pressure that has caused the increased numbers, not better technology (they could have released 3000mah NiMHs on day one if they thought it was safe). This might be fine for a battery you plan to use in a remote control, but for high drain applications it mean your battery will get HOT, it will lose its capacity fast, and when it dies (relatively quickly) it is likely to be a catastrophic failure.
I have some nice MaHa Powerex cells (2300mah) that I plan to use until they die, then I will be very picky about what higher capacity cells I purchase, if any.