i just reread your original post, this is gonna come down to your preference. you say you don't plan on coral so i see no need for MH. MH gives a cool effect in a tank, reef or not, but the operating and initial cost will be up to you if it is worth it.
for your rock to function, you only need your NO bulbs if any bulbs at all.
for a tank that size, MH may be worth the additional electric bill, but it is far from neccessity. NO bulbs will be lacking in luster and won't provide enough light for your fish to look thier best,... IMO.
i will further back up the idea of VHO, if you wanna do reef later you can use this VHO for supplemental actinic.
but, if you are simply wanting to keep the rock alive for a while, you need nothing but what you have.