I agree with B, get sleeves if you wanna bore it, honda blocks come with such a small amount that can actually be removed it's rediculous. The stock sleeves that are in B and D series engines (and prolly the others too) are about 1/8" thick (or 4mm) at the top and get thinner as they progresstoward the bottom of the bore.
Sleeving the engine will make it much stronger, capable of taking much higher cylinder pressures (turbo/chargers/nitrous/really high compression) and add supreme duarbility.