The second motherboard you've posted is a 939 board, but the DLI board is an excellent overclocker from what I have heard, add in one or two sticks of 512mb DDR400 and you should be able to overclock pretty well.
With the rest of your money, I would invest in cooling products in order to increase overclocking potential. Whenever I have a computer that I feel is slightly out of date, but don't feel like buying new parts just yet, I generally soup it up with some cooling and overclock it.
The nice thing about this is the fact that unlike actual parts, cooling hardware isn't going to underpeform in newer systems and it can easily be transfered into future systems, unlike actual PC hardware. Very good investment in my opinion, pick yourself up some heatsinks, fans, and even watercooling if you really wanted to.
Intel C2D E6320 / AMD Athlon X2 3800+
Gigabyte 965P DS3 / DFI nF4 Ultra-D
2GB OCZ Gold PC2-6400 / 2GB OCZ Gold PC4000
eVGA 8800GTS 320MB / eVGA 6800GS 256MB
150GB Raptor / 74GB Raptor
2x500GB / 320GB
OCZ GameXStreme 850w / OCZ StealthXStream 600w