If you plan to spend the extra to upgrade the D-Premiers to a 1000 Pro, you would essentially get a new 1000 Pro with all new internals and warranty. I'd check how the price of upgrading the D-Premiers compares to buying an upgraded 1000 Pro.
If you don't plan to upgrade the D-Premiers, then I'd go for the 440 Pro. It should still have resale value if you ever feel the itch to go 1000 Pro in the future.
If you don't plan to upgrade the D-Premiers, then I'd go for the 440 Pro. It should still have resale value if you ever feel the itch to go 1000 Pro in the future.
Devialet 1000 Pro CI - AQ Diamond AES RCA-XLR Link
PC - ifi iDefender+ - FIBBR Alpha Optical USB + "Studer 900" LPS - Singxer SU-6 - AQ Diamond AES
PSB Imagine T3 - AQ William Tell Zero / Tornado / DBS Level-X - PliXir Balanced AC