I'm allmost in the same situation like you Tom...i have a 1975 Stage Piano mk1 seventythree. And i like the sound of the suitecase. But a suitecase has an very high price tag actually, and are not easy to find, in good shape.
So i began with the stereo Pulsar. It was not bad, it has a lot of possibilities, but i had a gain loss with this pedal, and the speed was not easy so set between the left and right channel, it's never 50/50 (in therm of duration) it's more something like 60/40, not a perfect equal stereo paning.
Last year, i bought the new MXR Pedal, directly in the USA, it's a lot cheaper than in Europe. And for the price i payed, it's really good. The MXR boost the sound, no volume loss, and the paning is really good.
I can mail you 2 small sound samples if you want. PM me your e-mail adress and i will send you in the next days. Ok ?
You can also give a look to this preamp & tremolo rack :
You also have sound example on this page :
Jens Lüpke Preamp-tremolo
It's an external rack solution, that sounds very very good (to my ears)
Another solution, if you prefer everything in your stage piano, it's the Quadrapuss from Vintagevibe.
With the Quadrapuss, you have a stereo classic tremolo, the Dyno My Piano EQ, Small Stone Phaser circuitery, all in one rail. The price is correct (650$), when you think all what you have.
More informations here :
Vintage Vibe Quadrapuss
I have the Stage Vibe preamp (mono tremolo) from them, and i'm very happy.
Major key also had once a project for such a tremolo + preamp, but i'm not sure that it was once produced in serie.
But it looks great...
Theses are some other solution you could buy.
Hope it helps a little bit !
It is much easier to be a good equipment purchaser than to be a great musician.