There a few fairly large differences between them all, for instance the first and last ones are celeron, whereas the 2nd one is a centrino, which would be the processor of choice out of all of them.
However, the centrino model comes with a paltry 40gb drive and lowly 256mb ddr2 ram, which means xp will run like it's had glue poured all over it (unless you upgrade it). The first one, is plentiful in this area, loads of ram and hd space, the last one not so much.
None come with independant graphics so none will play any modern games.
Out of them all, and without knowing what your looking for, the most well balanced machine in terms of price to performance (spec) would probably be the first one. Celerons come in for a lot of stick, mostly undeserved and they are quite capable of doing most tasks as efficiently as the all guns blazing cpu's. In other words, the latest core duo cpu's aren't going to make word go any faster than a celeron.