The VF30 and VF34 are pretty much the same just the bearing types are different, the VF30 has a split thrust bearing and the VF34 is roller bearing, they both have the P18 turbine, the VF35 is of the same beating type as the VF30 but it has a much smaller P15 turbine, out of the VF range it has to be the fastest spooling turbo for its size.
As already stated the TD05 16G or 18G are worth considering the TD turbos are also thrust bearing turbos.
I can vouch for the VF35 as I run one on my Sti, it is a mega fast spooling turbo.
Cheers Iain