You haven't really given a budget, but if you're willing to pony up for an audio interface and an XLR mic, there are a tonne of great condensor voiceover mics, the Rode NT1-A and SE x1 both have pretty decent bundles (especially the x1, with the reflexion filter). Neither of those mics will pick up the whole house, I've used both with decent success. If you're SUPER worried about directionality, have a look around for condensers with a hypercardioid polar pattern - they're often used to record toms on a drum kit, and will pick up ONLY what they're pointed at, no surroundings. Another option is the Shure SM57, the industry standard for affordable dynamic mics - cheap, works well, sounds good if you sit up close to it (doesn't look as cool/beefy as the nice condensers though). Basically, have a listen of audio samples of all the mics I listed, pick the one that you like the sound of most.