Looks like there's already plenty here you can use to make an informed decision, but one more thing to think about:

Typing speed, beyond a basic level of competence, has pretty much nothing to do with programming skill. In fact, if your bottleneck is typing speed, you're likely better off stopping and spending some time thinking about how you might be doing things differently. (Not that we haven't all been there, but it should be a vanishingly small proportion of your overall time, hopefully.)