Newbie Question. I just started working on my Ashford RHL that came with a 7.5 inch reed. (Love this RHL!) I am learning that the dent size is good for heavier fibers. I think I'd like another size reed for lighter weight projects. If you were only able to afford one new reed, what size would you get and why? (My choices are 5, 10 and 12.) Thanks in advance.