Craig - I've owned a Spoiler-Exploiter, a limited edition Spyder, a Dragon's Wing, a Europa, and now own a SC Sig Std, a Series II, an Essence and an Epic. I'd offer these thoughts, based on my experience with the different electronics packages in each.
Signature Electronics (SC, Dragon's Wing): After Series electronics, my favorite set up. Simple to use, lots of available tones. It won't take long for anyone to dial in some favorites. Very versatile as well.
Anniversary Electronics (Spyder): Closest thing you can get to Series electronics. Very crispy sounding, with gobs of high end. Versatile, but for me not as versatile as the Signature Electronics.
Spoiler Electronics: Good, but not as versatile as the others. Possibly my least favorite of them all, but that's just me.
Epic Electronics: Simple, straight forward (volume, pan, bass, treble). You don't have filters here, so you don't have that option tonally. Great for those who want a simple, quiet, more traditional set up.
Europa/Rogue Electronics: Fairly simple, with volume, pan, filter, Q and tone switches. I liked them, but not as much as the Signature electronics (I'm not one to change tone settings all that much mid song, so hitting switches to boost/cut wasn't my thing for the most part). Can get some very interesting tones, and the boost is great for soloing.
Series Electronics: Mine are Series II, and they blow everything out of the water. Gobs of tonal options, plus you get a master volume control (Series II). Continuously variable Q, allowing you to tailor the boost of the frequency anyway you like it, a great option indeed.
All this being said, Graeme is right. If you have the ability to play an Alembic (as many different types as you can), do it. Only you can decide if that instrument speaks to you. Alembics are not for everyone, just as Fenders, Musicmans, etc. are not for everyone. If you pick up the Rogue, and don't like it, you can probably sell it and get the vast majority of your money back. Totally your call. I wish you well however you choose to go about it.
One last thing - my first Alembic, the Spoiler Exploiter, was purchased sight unseen over 9 years ago. I've been an Alembic player ever since. Food for thought ... ;-)
Alan