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 Whenever I have a computer that I feel is slightly out of date, but don't feel like buying new parts just yet, I generally soup it up with some cooling and overclock it.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.