I generally recommend AMD based systems. (for the cost savings and improved performance)
If you are going to go with an Intel based system, I recommend Intel motherboards.
You generally have fewer conflicts with an Intel board.
I looked at the D865GBF.
I try to avoid boards with built-in sound, and on board NICs or modems.
If you are planning to run multi-media applications, you may want / need to install a separate sound card.
As to the hard drive, I agree with GuroOfDOS that an ATA133 drive is a better value.
However, since the IDE controller on the board only supports ATA100 transfer speeds, the serial ATA drive may provide better overall performance.
Unless the price is a lot higher, look at getting an 800MHz CPU.
If the price is a lot higher, this would be a good upgrade in a year or so.
What OS do you plan to install?
If Windows 98 / Me, drop the RAM down to 384MB. The core Windows 9X code can have problems with more than 511MB of RAM.
If XP, install as much RAM as you can afford.
The way RAM design changes, in a year or so, you may have problems finding compatible RAM.
What are you planning for video?
On-board video (Intel in particular) does not provide good performance for games or intensive graphics applications.
At 266MHz, the RAMDAC is slower than the one on my 3 year old 3dfx card. (350MHz)
If the PC will be used for word processing and web surfing, this is fine.
However, for digital video, gaming, and graphics art applications, you will want a separate video card.
So, you might want to check out a different motherboard that does not have the sound and video built-in.
Most people who build their own PCs are looking for better performance than they can get with retail PCs.
The 865PERL or the 875PBZ may be better choices depending on how you plan to use your PC.
Chas