I'm not much help on jigsaw blades, but as far as a router, I'd buy the best you can afford. I haven't found a lot of difference between the fixed base and plunge types, but others with more experience may have better opinions. For a router, I have found that ones with half and quarter inch capacity are handy. Some of the big bits with half inch shafts are very useful. Good bits are a very good investment - they stay sharp and last longer.
Good luck.