fcon v pro - but you need to find an automatic throttle bodie from a glanza or gt turbo and the tps sensor. the standard manual tb and tps is no good. it's also bloody expensive, and very few people tune it.
OMEX - is worth a look at, is relatively cheap, but you will need to run a resistor pack on the injectors to make them low impedence instead of high impedence (might be other way round cant 100% remember)
emerald ecu i have heard is good,
DTA,
theres another on i cant remember.
but most of these standalones require you to make a custom loom, and you will need a gt wiring diagram.
but by fa the easiest standalone ecu to plug straight on is the apexi power fc.