I switched to an all-electric HERMS this year. I started about a year ago and was intending to modify my existing system (propane-fired keggles) and to try to model it after the Spike System from Spike Brewing. Once I priced out all the fittings, components, controls and some necessary electrical work, it didn't cost a crazy amount more to just buy the Spike System with 15-gallon kettles and control panel - so that's what I did. I've passed the propane system on to my son, who also brews.
Of course, you could do it on your own for less money and a lot more time spent on building & assembly - especially if you don't use all stainless fittings and build a somewhat stripped-back control system. Those things can always be upgraded over time. I'm at the point in my life, though, where I have enough discretionary income to spend my time brewing instead of wiring a control panel. All that said, I'm really happy with the new system and wouldn't change much of anything.