If you can swing 11spd, do it ! I put 11spd on the Knolly, and it was the best thing I could have done. You'er best bet on the cheap would be 30t NW chainring, and wider range 9spd cassette, but by the time you by a decent chainring and cassette and a new chain, you'er getting, if not past, half the price of going to 11. I've done the one up cage route on my 10spd, and it worked ok with both sunrace, and shimano cassettes, but i avoided the cassette conversations, so cant speak to that. I did have a bad experience with a Praxis 40t braking teeth though. What I wouldnt do, is buy the 30t ring without getting a new cassette. By the time you get a bigger cassette on there, your chainring will already be wareing in, along with your chain. I know its expensive to do all at once, but its really the best way. Trust me, i've tried all the cheap ass ways to go wide range...lol. Besides, its sort of counterproductive to add more front teeth, even one, if your end game is really a lower gear ratio overall.