hhahah jk's man ..
i would say get the leads first b4 the earths grounding wires..
correct me if im wrong ..
Leads coz .. it may give u more sparks as it has less resistance (assuming good brand and claimed to be low resistance) which comes as better combustion ... that equals to save fuel (complete burning no excess fuel) and more power.. (more fuel burn = more heat = power, in exchange but u may fell it and may not)
Grounding wires is to stabilize ur voltages... so it doesnt fluctuate too much .. the proven to be the best arround is HKS gold plated earthing wire...
so i would suggest you to go for leads first.
"are they worth putting?"
they are worth puting if your old 1 is worn out.. or bling2 factors
"Do they do much?"
Not a significant figures.. 1-2 hp max on each probably
hope this help

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