PCI E 1.0 or 2.0 is it worth it?

You heard wrong. Compared to p35, p45 runs cooler, overclocks higher, and is more stable. P35 was a popular chipset, so there is a lot of misguided "loyalty" toward this particular obsolete, although still decently performing piece of hardware. Another thing is, p45 is the official replacement of p35, which is going out of production. Support is going to be poor from that point forward, as with all discontinued hardware.

the review on the p45 on tomshardware says its crappy and not worth it ...tom says the p35 is the way to go??

Pcie1.0 will bottleneck hd4000s cards in cf, but not earlier hd3000s. It's a moot point for p45 though, since in cf mode, it runs pcie2.0 at 8x, even though pcie2.0 doubles bandwidth, it's still the same as the old pcie at 16x. You'd really need x38/48 to cf hd4000s cards.
http://www.tweaktown.com/articles/ [...] index.html
Of course, old p35, with its pcie1.1 at 8x each in cf mode, will really tank those graphics cards.