Straight edge cuts

[cdm]

What is the best way to get straight edge cuts in alum plates of 2-4mm thick? For instance when you want to make some body panels that actually fit together..

I have been told horizontal bandsaws are better than vertical ones (what i use) due to less blade wandering but in order to have a 10" cutting reach you have to buy industrial grade.. All the tabletop ones i've seen are for pipes or angle irons and wont span more than say 5" at very best.

Metal cutting places give wild accuracy guarantees ranging from 1/8" to 1/4. And only go straight pieces, if you need an L shaped piece, you are still out of luck.

I wont bore you more. How do you guys get those precision cuts done?