Could I suggest that you get that job (any job part or full time) quickly.
Fill up Form 12a on first day of employment and you will then get a PAYE allowance (not available to Self-Employed). This will mean the first €8000 approx. of PAYE earnings in 2007 will be tax free.
Make a year end tax return to include both you and wife,s P60's plus any income form self employment.
Move married tax credits to wife (as it appears she will be the higher earner)
Finally don't forget to De-Register as Self Employed if you intend to remain a PAYE member and have totally given up the Self Employment
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