If you only have $50K and want to get started, look into "hard money" loans. A hard money loan is where a lender looks at the deal and lends money based on the equity position of the property, not so much your credit or income.
Hard money loans are more expensive on interest and points so you need to lower your purchase offer to cover the additional interest.
As to your original question,
Which would you prefer? $100K purchase with a bunch of financing contingencies or $95K cash, no contingencies, and close by next Friday?
There are lots of ways to skin a cat, Cash is King but not the only way.
ooops! The poster above beat me to it!