Funny thing, while I haven't played a 6, I HAVE played a Rev-2, and discovered that there are enough key differences between it and the Take 5 that pairing those two would be a personal Sequential-toned holy grail. Take 5's potentially mean 2140 4-pole filter vs the Rev-2's Curtis 2/4-pole filter + the Take 5's ability to keep it simple as well as dial in complex modulations means the T5 can be a bass & lead monster to counterpart with the Rev-2's more textural focus. Moreover, it's designed for better portability, so if you had to have a compact grab-n-go (I play bass and double on keys with my T5; a bigger keyboard would literally not fit my small hatchback), it's a solid choice.
That said, the Analog 4 and Novation Peak are absolute monster synths, with features like wavetable oscillators, multi-layered track sequencing, multimode filters, the Analog 4's insane macro knob feature, etc. The T5 does have full-featured expression pedal mod matrix assignability, which I use and dig.
Also with THAT said, if you're saving that much on getting one, you'd likely make basically all your money back if you decided to hand it off. That alone makes it worth considering, and who knows: might become a new favorite versatile pack mule with world-class analog tones.