Right,
First of all, there's nothing wrong with the Losi motors, in fact they're very good. The speedo however not so much.
So if you're going for a motor with similar turns but different brand, I can garantee you'll barely see any difference.
Likewise with the speedo, as long as it works it provides good speed. It's the reliability department that is the Losi's downfall. From what I've seen the fans can break (and they don't like running with no fan at all), the speedo sometimes loses all speed for no reason, I've even seen one go backwards (when it had been doing fine the run before). Sometimes resetting the speedo with the PC interface gets it back to normal, but not always.
End of the day it's NOT a competition speedo and it is reflected in the pricing, and quality.
More expensive speedos are bound to be more reliable and in most buggy applications will not thermal if the fan stops working, will keep their settings etc...
Top of the range speedos also are very adjustable, brushless technology is a million miles away from the brushed you've known. In brushed you needed to prepare the motor to get the best out of it, good brushes, proper springs, etc... None of that in brushless, it's all down to the speedo's software, and every manufacturer does it different.
I would say your best bet is to keep your electronics as they are as the 6.5 losi combo is certainly fast enough for a 4WD buggy, and you might be lucky with your speedo (some people never have problems, some have endless problems). Then if your speedo starts getting gizmos, have a look at a better one.
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