I live in Lomianki, just 1 kilomotere north of Poland. We have here a Ferrari 612 Scaglietti, Maserati 3200, a few BMW 645's, a few BMW 850's Corvette's,a few Porsche Turbo's etc.

And we have an Enzo and an SLR in Konstancin, but the owner uses those cars quite rarely
If you are looking for good cars concentrate around small towns on the outskirts of major cities. If Warsaw, then stick to the city center...there are usually nice spots there. Just lately I saw a few Nissan 350Z and a 996 Turbo during a 15 minute walk.
Not much really nice cars here, the only Ferari "dealer" in Poland ships 5 cars per year.