If you only have room for a 120x120mm radiator, then the amount of heat that radiator can shed will be the limiting factor. I think you may be able to cool a P4 and 9600 with it, but they won't be lots cooler than air cooled - particularly if you are using already-warmed case air.
You may find that the best solution is to go for a new case now - one that can fit a decent sized radiator in the lower front. There may also be places in your current case where a larger radiator might fit. One of the attractions of the "big momma" sized heater core (about 6"x7" including header tanks) is that it will fit more places than the 120x240mm radiators.
You might give some thought as to why you were waercooling, which would make it easier to decide which direction to go in. "Why" as in quiet/silence or overclocking or "looks cool"...
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