If you intend to rebuild Hytbold completely (which involves a minimum of 44 days of daily quests), you will have no problem reaching Kindred with every faction by the time you finish. Accelerating your reputation gain would be a waste of your Turbine Points.
However, if you intend to do the least amount of work possible and only acquire a single set of armour for your main character, you might choose to accelerate your reputation while leveling up from 75-85. (Alternatively, you could accelerate your reputation while doing the Aiding the Eastemnet quests.) The specific reputation standings required for each armour set are noted in the class summary posts. Keep in mind that when you accelerate your reputation gains, it applies to ANY faction until it runs out. Personally, I feel this would be ridiculously expensive, but the option is available to you.