I have been using a skew for most of my spindle roughing and think I might want to try a roughing gouge. I don't have many tools but my favorites have been all Thompson or D-way and there is a huge difference in size and price between the Thompson and D-way spindle roughing gouges. Also, the Thompson SRG is out of stock, not to mention really expensive (>$220) and the D-way SRG looks really small in comparison to the Thompson (which explains the cost difference, I assume).

I guess I really don't need a SRG and my question is, is adding a SRG worth it, and if so, what size is recommended for medium spindle turning?
Thanks,
Tom