This thread is a tad old, but I just wanted to clarify something.
Singe does NOT emulate arcade games at all. Singe was a off-shoot of daphne designed for the creation of original laserdisc games. It set on a shelf for years unused but eventually it was released to SIMULATE the american laser games. In terms of arcade accuracy, it does a better job than the digital leisure releases, but that isn't saying much as they are always terribly inaccurate.
In other words, just like the DL releases, Singe uses the original arcade video footage with it's own code. Singe tries very hard to be arcade accurate though, so it is the better choice usually.