I Need to Change My Vice-Presidential Pick

Some blogs back, I proposed how each of the Republican and Repulsican candidates for President could best be utilized in and in conjunction with a Herman Cain administration.  Despite many misgivings about him, I suggested Rick Santorum for Vice-President, based on his experience, especially his leadership experience in the Senate.  After all, the primary function of the Vice-President is to preside over the Senate.  It makes sense to have someone well familiar with that body, particularly managerially experienced, to be in charge of it.  It occurs to me, however, that in putting together a committedly conservative administration, there are at least two current Senators who would be better than former Senator Santorum.
In announcing his pending retirement from the Senate and stating that he has no ambition for or design on any other political post, unless offered the opportunity to run for Vice-President, Jon Kyl of Arizona could be an excellent choice.  Having spent a long time, but not a lifetime in the Senate, including presently serving as Party Whip, Kyl would not be just another narcissistic one term Senator wanting to be famous and powerful, like Obama or Edwards.  That is primarily why I have so much trouble with the much ballyhooed possible and potential Vice-Presidential nomination of Marco Rubio.  Despite his conservative credentials and his representation of the important state of Florida and the important group of Hispanics, he is still  but a rookie Senator.  Senator Kyl has consistently been recognized and ranked as one of the Senate's most, most, most conservative.  He has been selected to ever higher levels of party leadership in the Senate, rising to second in command, so to speak.  My only problem with Senator Kyl as Vice-President is his age.  He turns 70 this Spring and is beginning to look his age. 
Another, much younger Senator, who ran for but didn't win one of Kyl's previous leadership positions and who plans to seek his present position of Whip when Kyl retires after this year, could be an excellent candidate for Vice-President, especially on a ticket with Herman Cain.  My own senior Senator, Richard Burr has long been an advocate for and supporter of the Fair Tax, veterans, the military and other constitutionally conservative causes.  And like Cain, he is not a lifelong politician, having spent nearly two decades in private sector business as a corporate sales manager.  And as a sidenote, he is distantly related to a former Vice-President.  Popular in his and my politically important state of North Carolina, he has a graciousness and gravitas that would make him a positive plus to Cain's campaign. 
Either of these men would serve well as a running mate to any of the Presidential candidates and as the person a heartbeat away.  Burr would probably be better, if only for the age thing.  Though considered by some to be unremarkable as a Senator, he is well regarded and respected by his Senate peers as a principled representative of his state and his constituents.
As for Santorum, I think that it would be better to have him several heartbeats further away.  As it has recently come to brighter light what a supporter of big union labor he is, make him the last Secretary of Labor, overseeing the downsized, streamlined reorganization of that department into a less bureaucratic division of Mitt Romney's Department of Commerce.