Hello David,
Do you mean a wall-mounted glass-cutter?
If so, the the Flethcher 3000 is a good choice. If you intend to cut 3mm mdf then the 3100.
Insert a carbide wheel instead of the steel wheel for a better score.
When it comes to hand-held glasscutters, don't take the one with six wheels, but instead get one that is oil-filled. There are previous posts as to which brands are good.
Diamond cutters are good quality too, as they last a long time before the tip needs replacing.