Now if you were on the 155.org forum you would get someone pointing you to each and every version.
A couple of facts :-
1. Silverstones are all 1.8 and are poverty spec at that.
2. Only a madman would attempt to run a Q4 as an everyday car, ask me how I know

3. V6 155s sound awesome
4. 155 16v 2.0 handle the best ( I will get V6 lovers arguing with this fact but it is true)
5. Rear wheel arches rot, if you can see bubbles on the outside they will be shot on the inside
IMO if you want an everyday car go for the best condition car for your money that you can find. All 155s are good and they all have their weaknesses. V6 cars can be thirsty especially in traffic, later 16V cars need regular cam belt changes, Silverstones are slow.
Personally I would go for a late 16V TS, either 2.0 or 1.8 the latter are always cheaper and not that much slower in fact as they don't have the balancer shafts they tend to rev better. Both these versions should have widebodys (which look better - fact IMO ) and quick racks. They pull all the way to the red line and handle like a go kart (one of the best balanced FWD chassis out there) and if the brakes are right they will stop on sixpence.