Go for the 700E, it is cheaper and will make it above 133MHz more easily. Most PIII's (even the "slow" ones) can make it to about 980MHz. With the 700E. 980 would come at 140MHz bus speed. With the 800E you would only be at 122MHz to get 976. This is where the motherboard comes in.
The best availble motherboard for overclockers right now is the Asus CUSL2-C. Few people dissagree with that fact. It uses the 815E/815EP chipset, and support sytem bus speeds over 200MHz!
The tricky thing is this-PCI/AGP dividers. At both 100MHz FSB and 133MHZ FSB the PCI/AGP frequencies are stock. This is because the dividers switch from 1/3 and 2/3 to 1/4 and 1/2 when the 133MHz bus speed is reached. So anything BETWEEN 100 and 133 overclocks both PCI and AGP. And anything OVER 133 does the same. At 132MHz, the PCI bus is 44MHz, which cause some cards not to work. But at 133, the divider switches and PCI bus is back to 33MHz.
We know that the faster we run the system/memory bus the better the computer performs. So using a 700 is preferable to using the 800 at the same speed because the system bus will be running faster. Even at the stock 133MHz system bus, the 700 is running at 933. The 800 at a similar speed (936) would only have a 117MHz system bus. So your memory would run much slower and your PCI bus much faster-not a good deal.
Since the 700 will overclock as far as the 800, but at a higher bus speed, it is proeferable. But MOST PIII's have a dificult time achieving 1000MHz. If that were not the case, the 750 would be the best choice. But since it is, get the 700!
Suicide is painless...........