Gentlemen,
Those of you arriving early and looking to stay in Amsterdam. Are you thinking right in the center? What's the budget? Really there are a lot of factors that make that kind of recommendation difficult.
This website is very useful for booking hotels in The Netherlands and you will find some of the best prices here:
www.booking.com Here is a little idea of what you can except. There are 3 main squares, Rembrandplein, Leidseplein and the Dam. There are all about 10-15 min walk from each other so very close.
If you want to be by one of these squares you can pick a hotel there. Parking will be an issue at some so make sure you check it in advance.
Leidseplein: Marriott Hotel, Americain Hotel
Rembrandtplein: has an NH Hotel and a variety of others.
Dam: has a Swissotel, Kransnapolsky, the Grand, Sofitel (close by).
Tip: if the price is right, Pullitzer which I find quite unique since it's a modern hotel on the Prinsengracht (canal) that was built in 5 old canal houses (gentleman's houses).
There are tons of other as well, the site above does a great job of showing them off.
If you want something different or more specific, please ask.