Capacitor

If cost is the issue, then consider a smaller value VH Audio Odam. Perhaps a 1.0 uf. In the end if these are still too costly for you, then a Miflex will be better than the others you mention. Yes, I have used all the caps you mentioned.

Please be aware that the Miflex caps are huge and may not fit easily based on the value you decide on. Check for fit first.  Simply look up the dimensions and make a mock up using a properly cut and rolled piece of paper or thin card stock. 

Thank you so much everybody for your opinion and special thanks to grannyring

@ Grannyring
I had 4 jentzen superior Z caps changed them and was surprised how the sound improved though they are not burned in as yet just 10 hours
I guess caps do make a difference wondering how the V cap Odam or the miflex copper cap will fare will it be better than the Jantzen caps.

@grannyring
I have same caps with lower value 0.33uf 600vdc in my tube mono blocks also do you think changing them will also bring a good difference

The Odams are much better than the Jantzen Superior Z which I am very familiar with. Different level of sonic performance and nuance to be frank. However, they do cost more.  Where are you located?