like all the boys said you cant beat a good blade for quality and speed but you should be able to reproduce the quality just take your time after all most cuts will be dry anyhow
I like using an angle grinder as it is a lot less bother to pack around, no water to muck around with and the blades are much cheaper.
I have an assortment which I use for whatever different materials I run into.
The only drawback is all the dust it creates.
I have a large industrial vacuum which I use to minimize this issue and use a plywood board with a small strip of lath to use as a rest on one side as a cutting board.
Invest in a good quality die grinder with a vacu-brazed, not electroplated diamond bit which is used by the monument industry to do little alterations.
A dremel tool with the small diamond wheels and specialty tips like dental tools proves very useful as you can take out minor imperfections after the tiles are set prior to grouting.
Lots of slate I get to work with is totally out of square and there is no way that I am going to refab every piece to make it right.
I snap my lines and find the happy medium and then when it is dry I use a grinder or dremel to make the grout lines perfect.
This trick works primarily for stone, but you can use it to tweek those less than perfect cheap tiles which are not quite symmetrical enough.