Oh aye, I didnt notice he said newer version of the emaxx- my excuse is that I;ve had a horrid flu virus the last week, so my brain is thoroughly addled...
3905 is fine as a basher, no real need to swap over to the erevo- other than its better suspension for racing you arent gaining a whole lot in my eyes. I would sell the hitec servo and get a better one like JT said though- I use a pair of those and they dont do my Gmaxx justice, but IM too tight to get a decent digital servo, and Im not sure my Rx or MMM v1 would thank me either, what with the higher current draw.