same for me. i'd get rid of my helical head before i'd go back to 6 inch.I was lucky enough to do both ( go 8" and helical). After having knives for 15 years, I love my helical.
That said, if I had to choose between 6" helical and 8" knives, I'd go with the 8". People have obviously been using knives for years with satisfactory results and the extra 2" is really handy if your work projects can take advantage of them.
Joe