For groundstrokes: All depends on what you are looking for. Your form and play style are huge factors in this, so there's no real answer. Any selection from any list you could create would be wrong, because this is going to vary greatly from person to person.

Best frame for the price? I have to go off your list for this one. I'd have to go with the Prince Speedport Tour. It's the best frame I've demoed in a long time. If I had the money, I'd replace my current frames with these. Especially now. At tenniswarehouse.com, they are on sale for $99. But you can buy new demo frames for $79 (unused, but already strung). Definitely the best deal on a great frame at this time.

Best overgrip: Finally, something I can answer. B. I love Wilson Pro grips. I can't say I've tried the gamma or yonex before, though. There's just something I don't like about Tourna Grip. And when I tried the babolat overgrips, I wore through them extremely quickly. The Wilson feels great, and is pretty durable.