Looking for an upgrate from Cronus Magnum

Thank you everyone for the responses! I got in touch with a local audio shop which have used Pass INT150, ModWright KWI200 and Primaluna HP integrated. I am planning to bring my Cronus Magnum to the shop to compare with these amps. My problem is not only lack of bottom end, but when listen to rock music or any modern song with mutiple instruments, it lacks of clarity and seperation. I read from somewhere it is typical from tube amplifier, lack of air and not clean like SS.

Quick update. I took home the Primaluna HP integrated. WOW what a great amp! Perfect match for my speaker! Everything is better than Cronus Magnum! lower power but more powerful bass! I dont need to buy a subwoofer now! mid is richer and fuller. high is clearer. I can enjoy rock songs and hip hops now! It also has more detail than Cronus. It costs $2000 more than Cronus Magnum but to me the level of sound improvement is worth for more! It is 20lb more heavier than the Cronus Magnum. May be that can tell about the quality. It is better than the same price level SS amps which I auditioned lately.

For the sound I am getting from Primaluna HP and Salk HT2-TL, I can now forget about equipment and just enjoy music! 

I forgot to mention. I also auditioned a Krell s550 with a Kef R500 and Kef LS50. It was pretty bad and sounded harsh with the LS50 when I play rock songs, but vocal was ok. With R500 it was sweet sound and extremely clean/quiet, but a little bit lean to my taste. I just prefer fuller sound, feel more emotions in it.

Charles1dad, yes I did but not with the same speaker unfortunately. The Primaluna was with Sonus Faber and another shop had the Kef R900 both were excellent. Sonus Faber standout in vocal and accoustic songs but not as good in rock songs compare to Kef or my Ht2-TL. I can live happily with the Kef combo as well. However, they were not auditioned in the same room or settings so it was not fair to compare. I also auditioned a Parasound INT, the ModWright, Pass INT but all with different speakers, B&W. Golden Ear. The SS amps all have tighter bass than the primaluna, but to my ear, primaluna leads on everything else. The sounds is more warm and emotional, and fuller body yet details still retained. Considering my speaker is on the neutral side and not warm, also my music taste is so wide, I decided the Primaluna is more suitable for me. Another pro for Primaluna is it has the option to use KT150 for even tighter bass but the con is it has 8 power tubes so I will need to pay about $800 to change the EL34 to KT150 or $400 to KT120. I decided to stick with EL34 for now. It is already excellent now with the original EL34 and less than 100 hours so it may get better after open-up. Tube rolling will be my next year project. :) Very happy for now!