Thanks for the replies and your advice
Besides this topic I also PM'ed an Oople and Tamiyaclub member about it, and he recommended me the Savox SC1251MG - It's stats are a huge step over the servos I previously owned and I came across a good deal for one.
It's low profile and it's low weight could upset the weight balance, but there's plenty of room for weights due to the size of it
I'm sure there will be some pictures of my new 2WD in the Oople forums soon!