Every so often, someone starts another Steinberger thread. So, let's roll with this one, but as always, a note to the OP: DSR (do some research) here on TB, because there are a lot of threads on these topics.
The original all-graphite basses are wonderful, but generally are very expensive on the used market. Going that route is not what someone who isn't familiar with headless basses or Steinbergers specifically ought to do.
However, since Honeyiscool made reference to "spec sheets", he may be talking about either Synapses or Spirit XT's, which are the only models in production.
Synapses have some design innovations over the original 80's models. Some enthusiasts poo-poo them, other players love the design. They can be gotten used for 600-700 and thereabouts, and for that price are a good deal.
I have never owned a Spirit XT, but I have played several. They are solid neck-through instruments that feel very substantial.
Enthusiasts dismiss the Spirits, but I have found them to be a low-cost way to enjoy the headless design. They are well-made, and are an excellent platform for mods that kick up their sound considerably.
I still have my three Spirit XZs. The XZs are no longer in production. They are getting harder to find on the used market. You can still find them occasionally for $300-400.