Budget $2.5K-$4K depending on the condition of existing parts and whether or not you decide to take the motor out yourself. No matter what, my advice would be for new valves, valve springs and valve seals. Add more for custom ODB0 ECU, new clutch and tuning.
EDIT: I think new a6 valve springs are near impossible to find. Also, join HPD if you have not done so already. New OEM parts at wholesale pricing. http://hpd.honda.com/racing-line/become-a-member/
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