I would include a oval with a figure 8. This reqiures 4 switches and a 90 degree crossing.
This basic layout give two reversing loops, lots of switching action and ability to run the oval and the 8 in either direction.
I you are doing this on a budget, try Marx switches. The old metal ones should go for $10 a pair at train shows or ebay. I have 27 on my layout.
Here is a link showing my big board control panel layout with the oval and 8. I have a turntable in one section of the 8.