First, a tablet is not going to replace the performance of a laptop. Ever. But hopefully you know that and are willing to concede shortcomings it may have as far as performance goes when creating documents in a word processor.

That said, that keyboard will probably be just fine. I have the Logitech 920-003390, which I would say is not worth the extra money, assuming that Motorola one works with the current release of AndroidOS for the N10. The case that also operates as a tablet stand is pretty much only useful as a keyboard case. Hopefully you, like myself, have purchased a case for your tablet that has multiple viewing angles, negating the utility of a stand. Performance wise, the logitech keyboard is a comfortable enough size, works well and I don't run into any issues pairing it. Though I haven't had any issues with it being 2xAA battery powered, I much prefer any wireless device of mine to be rechargeable.

(If you're wondering "then why did you get it?" -- it was a gift.)

http://www.amazon.com/dp/B0054L8N7M/ref=cm_sw_r_an_am_ap_am_us?ie=UTF8

I bought mine on an eBay buy it now.

There are algorithms that are constantly updating the prices of all of their stock, based on a lot of different factors. Factors like how much its selling, and how much other web sites are charging for it, and how many they're selling. They are designed to make the most money possible, so if it sees a competitor with a similar price, it might put their price just 1 or 2 pennies higher. And sometimes these algorithms end up watching each others little price increases, and get stuck in a loop, so they both increase the price of some product to something outrageous.

Humans fix it eventually though, it's back down to around $50 now:

http://www.amazon.com/Logitech-920-003390-Tablet-Keyboard-Android/dp/B0054L8N7M