Phreher,
The 40.1 would be my last upgrade but i am done for now. I am 90% happy with the HL-5 and need to be very sure before Ill take a move. To me, upgrading has never been 100% guaranteed; it's like hits and misses and I always ended up having tradeoffs. I went the other day to have a listen to the D38R (ProAc) which is twice the price but cannot say Yes, replace them! I have been enjoying a lot of music since the HL-5 arrived and should be satisfied for a while.