Sean, Megajolt is the one for ignition only but it is limited.
Megasquirt is the one to go for as it will allow you to do much more. If you ever wanted to run NOS it will run that too
just one example.
What crank sensor will you be running ?
If you have the 36-1 toothed wheel then the V3 board is the Megasquirt to use with the Megasquirt 1 processor chip.
In kit form its £165 and built its about £50 more. If you order one from the USA watch out I got and nice bill from customs for the extra VAT
I'll PM you the lads that build them over here.