I started my ARC journey with the Ref 5SE followed by the Ref 6 and now the Ref 10. The Ref 6 is without a doubt the Best Buy of the three - the change from Ref 6 over the 5SE was a significant improvement, while the Ref 10 provides more of what the Ref 6 does well but the change wasn’t as significant as moving up to the Ref 6 from the Ref 5SE. Get a Ref 6 and replace the stock Sovtek Tubes with Reflectors (6H30P-DR) and Winged C SED 6550C’s and you will be close to a stock Ref 10