Pick the right growth candidate, hold your nose at the valuations, buy and hold for a few years until the growth catches the fundamentals up. Or wait until (assuming) the market drops at some point and buy the growth at dramatically more reasonable valuations. I'd also say buy what you know; that is, if you have experience with a company and know that their products are particularly good, providing the company a likely advantage over time assuming they're well run. I don't know much about Zuora for example (so if I want to buy it, I'll spend a lot of time on research), but I plan to stalk DocuSign for a reasonable entry point as I know their products well and I like their position.