I think the idea of getting a ST (and for the gutter-minded, that does NOT mean sanitary towels!) is brilliant... but then I would, as I've owned one or two

Choices... hmmm;
Pan 11/13
FJR
ZZR11/14
Sprint 1050 (though the 955 is still pretty good)
VFR
K1200S
Busa
Blackbird
Oh and from the outfield;
Aprilia Futura (I know, Iknow)
Ducati ST2/4
OK then what's what with each of these? These are mostly just my opinion/perception, so son't quote me

Pan 11/13
Heavy, thirsty, more tour than sport, comfy, might be a bit lacking in power after a Ninja. 11 is getting on a bit & the 13... well you may get unlucky with that infamous handling issue.
13 MCN ReviewFJR
Damn fine engine, can have soggy handling (allegedly), still heavy, not the most economical, comfy.
MCN ReviewZZR11/12/14
11 is pretty old now; suspension will be shot, eats disks/chains/tyres/etc, BIG grin factor
12 the forgotten ZZR, a bit tamer that the 11, but comfy & plenty capable. Handled better too.
14 OMFG factor, short tank range (in comparison), mile muncher par excellance
14 MCN ReviewSorry couldn't find a review for the 12
Sprint 955i/1050
Very nice handling, good consumption, very good mid-range, variable build quality, variable dealer quality
955 MCN Review1050 MCN reviewVFR
The 750 is probably too old, but who knows. Very varied opinions on the 800 VTEC(is that the right abbreviation???) or not VTEC. Known as a very good all rounder. Linked brakes (again; polarised opinions) which for some can seem weak, good build quality, go on forever
VTEC MCN ReviewK1200S
Don't know much about this, other than they're (apparently) very capable. Oh, and they're BMs, and all that goes with that brand
MCN ReviewBusa
More sports than tour. Comfy, heavy, thirsty, BIG insurance (so not likely to be any better than the Ninja)
MCN Review (up to 2007)
Blackbird
See Busa

Except better build quality & have lower 'hooligan' status
MCN ReviewAprilia Futura
Marmite bike; love the looks or loathe them. Had one & they're hugely underrated. Very good engine (hit red line in top), terrible dealer network/spares, good handling, extremely comfortable (ditto for pillion).
MCN review Ducati ST3/4
Know very little about these, but seem to be a bit underpowered (in compaison to other STs), handle nicely, thirsty, and of course thery're Ducatis (chich can be either a godd or a bad thing)
ST4 MCN ReviewSo there you go, my two-penneth-worth on STs.
Of course you could go completly off the rails & get a Buell