I am flying SFO to Houston and then on to Bogota Colombia. I already have purchased my United tickets (Economy but not basic). Is it worth getting Economy Plus seats? I am 6'00 and it would be nice to have more leg room and be able to get out of a window seat to the aisle and restroom. Each seat upgrade is around $100. Is it worth it? I have the same situation flying back on American Airlines via Miami. Flights are beginning of October.