Version 2 of the Andrew Jones speakers are definitely a major improvement. I'd say go for it since it's only $20. If you decide the voice matching isn't to your liking you could also upgrade your fronts at a later date.
There's no need to replace your rear speakers. It's most important for your front three to timbre match. If you could fit the FS-52s (mini-tower) in your setup that would be a logical upgrade. There's no version 2 of the BS41s. I suppose you could try the BS22s up front if the mini-towers aren't an option space-wise.