Well, I'm guessing you're going to get an earful on this topic. One thing you should consider before you buy any replacement bats. Do you boondock to any degree. That really is the biggest driver in your determination on how much you need to spend. If yes, then go for better quality. Do buy at least the same amp hr rating bats if they suited your needs with the original set. Don't overbuy just for the sake of "look how much bat power I have fellas", if you're more the shore power plug and play RVer.
There is NO definitive concrete answers to what you're asking, only users (this forum for one) that can tell you their expierence. BUT, that is only useful to you, if their power draws are like yours on apples to apples comparison. There are informative sources to read up on the subject to better grasp on how you should treat any lead acid bats you end up buying. Here is one for you to read, if you're interested
The 12volt Side of Life (Part 1). Good luck.