What area of the country are you in? Which heat source is the cheaper one to run as your primary when considering costs of gas and elec. in your area for your temp range? The visionpro you're looking at will control stages with pretty good flexibilty as far as your options for different set-ups.
There's some nice options you can do with the optional outdoor temp sensor. Did you download the installers manual from Honeywell web-site? You can control what outdoor temps to "lockout" aux heat and compressor at high and low ambients. So, there is some real flexibilty for set-up.