1. Corsair RAM isn't the best for overclocking...since you have the high performance RAM it WILL overclock don't get me wrong, but especially on the socket A system you'll probably be limited to around 220-230 somewhere in there and if you want to start pushing your FSB up beyond 200 then you need to have aftermarket north bridge cooling as it really sucks...
1gb of RAM on a socket A system won't go very far no matter the RAM though...you'll be limited to around 240 or so even with top of the line best in the world OC'ing RAM simply because the board is not made to handle it. Generally this will require some added voltage to the NB which again is why also you'd require after market cooling for it....All in all you don't see a huge gain in performance OC'ing the RAM and it can be tricky on this board...I know I have the same board
It IS quite possible don't get me wrong, sometimes the boards like it, sometimes they don't and since you probably have a newer board (purple dimm slots whereas mine is an earlier style with black dimms) it might even be more prone to OC because of that...
Anywho I'd say 2.9v dimm voltage and 2.5-3-3-7 and you could run up to 230 with that....at the most 3-3-3-8 with same voltage.
Your CPU should easily hit 2.5GHz, that's what I run mine at 24/7 use, however mine is the 35w 2400+ XP-M...not that thats a huge factor just giving you general info...mine takes 1.85Vcore to reach those speeds but the couple of people I've known with the 2600+ XP-M have been able to hit the same clock speed with lower voltage, this also may be the case for you....your PSU should be more than adequate, they are good PSUs
If I were you I'd first find out your CPU's limits simply by raising the multi and adding Vcore where needed and using prime95 to test for stability. You'll want to use large in place FFTs torture test and leave the program running for 12+ hours.....if it errors before then you need to add a tad more vcore and repeat the process....once you know exactly how far your CPU will go when OC'd, then you can start OC'ing by raising the FSB beyond 200 to achieve the same clock speed in which you know is the top.....at this point if the system becomes unstable you'll know it's your RAM/Mobo holding the OC back.