I've owned a stock JVM210H, 410H, and a Voodoo modded 410H. I've also owned a Shiva 20th head.
If it's only between a stock JVM (of any kind) and a Shiva, def get the Shiva. But if you could ship that JVM to Voodoo and get his mod for less than the Shiva, it's not as clear a choice. The Voodoo mods make the JVM a VERY nice sounding amp. The Voodoo mods give it cleans that rival the Shiva, and while it doesn't get exactly Bogner dirt tones, it has a LOT of amazing breakup, crunch, classic rock, metal, and modern metal tones. Plus, the JVM switching is a dream as a gigging guitarist. I gigged my Voodoo modded JVM for awhile, and it was tough to beat as a cover band rock guitarist.
I stopped gigging the Voodoo 410H because I was tired of hauling that heavy amp, but the 50w head would be much lighter and similar to the Bogner head. I'd look seriously into the Voodoo JVM option.