Tread design and material depends on what you want from your tires. There is always a trade off on designing a street tire. Your choice depends on whether you want aggressive handling, long tire wear, high speed, or good snow and ice capability. Street tires are a combination of all these but some do better at one or two aspects than others. an example: An aggressive handling tire means less tire life.
You will have to decide what you want out of a tire then research the different brands to decide which tire best suits your needs and budget.
Now, for your wheel size, here is a comparison to stock and your wheel size.
Stock tires - GT: 205/55VR15 - Diameter = 23.88" - Width = 8.07"
GTS: 205/50VR16 - Diameter = 24.07" - Width = 8.07"
So basically a 24" diameter tire