If you can afford it and you think the house will go up to 100K and plan on selling it. House value is only of use to you if you plan on moving, otherwise, it doesn't matter, you live in it.
Is PMI so long as you are below 20%? If so and you think you will have more money in the next year to actually put the 20% down, I would go for the house you love now if the market is on the low and then pay into the house so you can get rid of PMI.
But like stocks, it's all a gamble. You may run into life crisis and have to funnel money elsewhere and end up paying PMI for longer. If you can afford it while still putting into retirement and such then go for it, especially if housing is going to increase significantly or the housing market is fast in your area. For instance, in my area, I can wait to buy a house because there's always something to buy. Outside San Francisco, you can't find a house that stays on the market for a week. In that case, I'd suck it up. But for me in my area, I would wait because even if the houses go up, so will my house when I sell. Then you add the fact that next year you will know for sure if you have the "bonus" money or if you have no emergencies.