air fuel mixture control??? what do you use, apexi etc etc

[s12-newbie]

i'm interested to know what piggyback ecu to use for my silvia, & to know what is available to use on a budget, i know from the thread on here about modding the standard 1.8 that some use the apexi safc

what others are used, what abot megasquirt??? also whichever i decide upon is there anyone in the midlands that would be will to give me a hand to intal one as i'm only used to working on olde vehicles, carbs & dizzys

i'd like to have that bit of control over the air & fuel??? any help really appreciated