Mine runs at 51oC max load stock settings.
If you don't want to be too ambitious I'm sure stock hs/f will be fine I have heard of people getting up to 2.3GHz on stock cooling.
Be aware that the multipliers are locked on the new processors though so you'll need good ram (PC3200) to overclock the FSB instead.
Pentium 4 2.8 with M0 stepping.
Only air cooling tho