If the CSP is for United miles, why not just go for the United card? It also has no Forex fees, Primary car rental insurance, a bigger bonus, a lower spending requirement and more likely fee waiver or retention bonus after a year. The CSP gets an inordinate amount of attention because it pays bloggers money when you use their links. Check your account for a 50-55K offer, and if it's not there you can take the 35K and then send a secure message to Chase asking them to match the 50K bonus - 99+% of the time they do.

What makes sense as the first 2 cards for most people looking for miles for international travel are the United and AA cards, each with 50-55K miles signup bonus. Both programs allow one-way redemptions so you can mix and match.