Pentium 4 sockets were sockets numbers Socket 423 for early Pentium 4's. Then socket 478 for Pentium 4, Pentium 4 Extreme Edition and Celeron and socket T (LGA 775) for Pentium 4, Pentium D dual core, Celeron D and Pentium Extreme Edition.

e2200 would be better as it is newer than the Pentium 4 and is dual core while the Pentium 4 is single it has also been proven the e2200 is better than 2 Pentium 4 put together

The Pentium 4 and Pentium 4 HT differ only in the "HT" designation, which means "Hyper-Threading". Hyper-Threading allows one physical processor to represent itself as two "logical" processors to the computer, doubling the amount of tasks the computer can work on. It effectively allows you to have a dual-core processor while only paying for a single-core. Get the Pentium 4 HT!

All CPUs branded "Pentium 4" are single-cored.

The 3.2 GHz processor is slightly better. Please note that all 3.2 GHz Pentium 4s support Hyperthreading, so the 3.2 GHz isn't in any way disadvantaged.