Sorry to rain on your parade, but the best way to run skeletons is hand weapon + shield, for that parry save. However, spears can be useful and are pleasing aesthetically, so if you do indeed run a spear block, you may as well make use of that extra rank of attacks and go in a horde (10 wide) of at least 40 models. You could go in a bunker (5 wide, many deep), but it does depend on what you want from the unit and what else you've got in your army.
It's worth mentioning that, for VC at any rate, you shouldn't spend too much on core. In fact, you should spend as little as possible. So don't be dumping too many points into your skeleton unit if you want to include other core units.
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