Need Help on Build for Internet surfing and Basic Use

I'm building my very first desktop ever. I need to build a desktop that will be used for checking emails, having video conversations on skype and other IM programs, word processing and watching movies. I want to spend no more than $450 on this PC. I already decided on this CPU:

http://www.newegg.com/Product/Prod [...] 6819103688

I researched this CPU and I know that it's what I want. I do not plan to overclock since that CPU has more than enough power for my purposes.

What motherboard would you recommend for this CPU? I don't want to do anything fancy like crossfire, since this PC IS NOT for gaming. Ideally, I would like a mobo that costs under $90 and functions reliably. I don't want something that has a high DOA rate.

I will be using SATA 3.0gb/s hard drives that run at 7200rpm.

What type ram would you recommend? Is it possible for certain types of ram not to work with a mobo (even if the mobo accepts ddr2 800 and the mobo has ddr2 800 slots)? I don't want any expensive ddr3 ram. I would like to stick with ddr2 since it is cheap and readily available.

How about the other parts? I already have a really old ATX case from a Gateway PC that broke down. Would I be able to reuse that? Or would I have to buy a new case?

I already have a monitor, keyboard, mouse, and speakers.

The power supply from my old computer is an Astec (Model ATX250-3505). Would I be able to reuse that for this build? Or would I need something stronger? I would really appreciate any help. Thanks in advance.

Are you sure that all of the parts are compatible? Will the ram work for sure? Is it possible for certain mobos to be incompatible with certain kinds of ram (even if they do match)? Also, is there any way that I can check to see if the case is compatible with the mobo? If possible, I would like to save the $50. Thanks for your help I appreciate it.

The exact model is a Gateway 700XL. Here is a pic of the case:

http://common.ziffdavisinternet.co [...] 725,00.jpg