Hello cbucki, what tubes do you have in the PL? I would try some Gold Lion reissue KT88, Mullard CV4004 and CV4003. Great upgrade to stock tubes and easily worth the money spent IMO.
One thing you may have missed in 10 years is advancement in cable technology. You did indicate what cables you are using... Lately, I am really enjoying what Purist Audio Design cabling has done for my setup. I have been on the cable merry go round for awhile now and these really impress me with bold lifelike sound, incredibly quiet background, and extreme dynamic capability. Others may say that money would be better spent on new speakers or a new amp. I'm thinking you could hold what you got, add the better tubes, a good power cable in the PL integrated, some PAD interconnect and speaker cables. You may not want for new equipment after that. At least you will have a better base system for deciding what modern speakers you eventually buy. Lastly, I am certain you will hear of some more options/ideas from other members from here. My two cents man, good luck!
One thing you may have missed in 10 years is advancement in cable technology. You did indicate what cables you are using... Lately, I am really enjoying what Purist Audio Design cabling has done for my setup. I have been on the cable merry go round for awhile now and these really impress me with bold lifelike sound, incredibly quiet background, and extreme dynamic capability. Others may say that money would be better spent on new speakers or a new amp. I'm thinking you could hold what you got, add the better tubes, a good power cable in the PL integrated, some PAD interconnect and speaker cables. You may not want for new equipment after that. At least you will have a better base system for deciding what modern speakers you eventually buy. Lastly, I am certain you will hear of some more options/ideas from other members from here. My two cents man, good luck!