If you can afford it, go for the R5. The R3 is great, but you will be left desiring more in a very short time span. The R5 does not just come with the extra torque, but it come with a larger clipping range, a better feel for the road and just much more pleasure in general. I started with a T300 and tested out the R5 which was amazing. I eventually ended up going for the R12 to future proof, but definitely the R5 is better in every way.