I'm with Bob on this one. Playing in several bands always provides problems to me with 'signature' bass tones.
I hate having to tweak amp heads between numbers, especially in covers bands, so rely more so on my boss floorboard (GT-6B)for different patches & tone tweeks, having my amp set fairly flat, although my main amp head is a twin channel Markbass LMK with one channel set for fingerstyle & the other scooped slightly for slap. Any other adjustments are made from my Rogue, where the tone switches really come in handy.
When i went down the component rack route, i had a Trace elliot gp12 which was excellent at the time, but combining that with a RA 500 power amp & UV rack mount, the flight case weighed in at 6 stone! Mind you i think the Warwick Hellborg rack is quite weighty aswell, the power amp alone is about the 45lb + mark.
I envy players that can set their own signature tone & leave it, I'm sure the Eden navigator is a dream to use ( i used to use a metro twin channel combo with extension cabs)with a distinct Eden smoothness & versitility. The SWR Marcus pre-amp looks tasty as well & i've always wanted to track down an Alembic pre-amp, especially the super filter one but alas that looks to be 'work' to tweak the best tones from it.
As age creeps up & back problems!, weight issues are always fore-front of any rack seperates especially power-amps, to me, thats why i prefer the new(ish) 'digital' heads & neo speakers of the modern manufactures like Markbass,Genz benz etc.
Steve