I have an old Athlon 64 X2 3600+ which I am currently working on upgrading into a modern system for a home server. I have Fedora 15 installed on a new 1TB hard drive, so I can set things up, copy files, etc. while I acquire the components which will eventually make this system do what I want. Today I found out that an expense for which I had budgeted went away, so I have a few hundred dollars burning a hole in my pocket. I see both a problem and a solution here 
My goal: I want a system that can serve two purposes. First, a Linux development desktop. I want to be able to write and compile OSS Linux software. Second, a home server. Samba, databases, Subversion, maybe a build server. The load would, of course, be very low, since I would be the only one using it. 3D gaming is not on the menu.
The server aspect of the system doesn't drive much of the potential cost of the system, since the current CPU could do that just fine. I am more concerned about the software development and compiling aspect, so I definitely want to go quad core. I was looking at the Phenom II X4 965 Black Edition since it seems to provide good performance at a good price point. I am not dead-set on the Phenom II, but the quad core Intel chips are $80 at a minimum.
My questions are more about the motherboard, though:
1. Since the socket AM3 chips have integrated graphics, why do the AM3 motherboards not have video outputs unless the board itself has integrated graphics? Have I been looking at the wrong boards?
2. I want to upgrade the RAM as well, but I have a few sticks of PC2-5300/6400 laying around to tide me over for a paycheck or two. Will this work in a AM3 system, where the architecture is designed for PC3?
3. Finally, any motherboard recommendations? I have been looking through the list on Newegg and googling as I have questions, but it seems like I am not getting anywhere. Most of the motherboards seem to be of marginal quality, with odd quirks.
Thoughts? Suggestions?

My goal: I want a system that can serve two purposes. First, a Linux development desktop. I want to be able to write and compile OSS Linux software. Second, a home server. Samba, databases, Subversion, maybe a build server. The load would, of course, be very low, since I would be the only one using it. 3D gaming is not on the menu.
The server aspect of the system doesn't drive much of the potential cost of the system, since the current CPU could do that just fine. I am more concerned about the software development and compiling aspect, so I definitely want to go quad core. I was looking at the Phenom II X4 965 Black Edition since it seems to provide good performance at a good price point. I am not dead-set on the Phenom II, but the quad core Intel chips are $80 at a minimum.
My questions are more about the motherboard, though:
1. Since the socket AM3 chips have integrated graphics, why do the AM3 motherboards not have video outputs unless the board itself has integrated graphics? Have I been looking at the wrong boards?
2. I want to upgrade the RAM as well, but I have a few sticks of PC2-5300/6400 laying around to tide me over for a paycheck or two. Will this work in a AM3 system, where the architecture is designed for PC3?
3. Finally, any motherboard recommendations? I have been looking through the list on Newegg and googling as I have questions, but it seems like I am not getting anywhere. Most of the motherboards seem to be of marginal quality, with odd quirks.
Thoughts? Suggestions?