I consider wiper blades second only to tyres as far as a safety priority, as without decent ones, in a flash downpour, you can't see...
Am a big fan of Bosch Aerotwin flat wiper blades, so would recommend looking into these. An established eBay seller is usually the cheapest supplier.
Worth cleaning windscreen with a decent glass cleaner, and cleaning blades with same or meths whist fitting.