The Parkzone Slo-V is a good ready-to-fly park flyer in the $129 price range that is manuverable enough that it can be flow indoors.

From the Hobbico Flyzone line, I like the Ventura and Mini Ventura RTF planes. They sell for about $119 and $89 respectively. They are faster airplanes, but also more responsive. Still, they may not be ideal for a small park.

If you're curious to try the Slo-V out, there is a plane on G3.5 called the BLT that isn't wildly dissimilar in its flying characteristics. You might give that a try to see if you like that style of slow flight.