What upgrade?

Well, I have not thought about if my amp is the weakest point. Maybe true, but I would rather keep it for a while. I like the Rogue preamp, but I cannot get away with this idea of BAT synergy that many BAT users talk about. That is why I am not going to sell my Rogue until I really feel the difference by myself.
I just found a Agoner who is interested in selling his vk-30 with phono and remote at my budget (well somewhat over but still within I can manage). So, I will see how Rogue preamp pars with BAT preamp. If vk-30 does not outperform Magnum 99, I would probably sell vk-200 and vk-30 and go for something like Levinson 23.5.

Burson DIY kits? Well, I am not a DIY guy, but maybe I will explore that route in the future.

Thanks.

Pdreher,
I see you have Plinius SA-102 and Aesthetix Calypso. I have not heard any Calypso, but heard some Plinius int amps. They are indeed fine products.
For price wise, SA-102 and Calypso are more expensive than BAT. MSRP is $5000 vs $3000 (SA-102 vs vk-200) and $4500 vs $3500 (Aesthetix vs vk-30).
Also, SA-102 and Calypso are much newer components. I wonder how the comparison would have been if vk-250 and vk-32 were used. Well, that would not be a fair comparison either since BAT gears are 40% more expensive.
If I were to go for used SA-102 and Calypso, I would have to pay $2000 more ($3000 for BAT vk-200 and vk-30 vs $5000 for SA-102 and Calypso).

As of now, I am interested in seeing how vk-200 would match with vk-30 in comparison to Rogue. If vk-30 wins Rogue will go, and if Rogue wins vk-200 and vk-30 will go. I guess it would be rather unfair to Rogue since vk-200 has a better chance to work well with BAT preamps and Rogue may mate better with non-BAT amps.

I totally agree.

The process of trying new ones is fun itself. It does not always turned into a fairy story, and sometimes ends up being a painful and costly endeavor, but it is an endless journey for many of us.