Plane Shift's power will depend a lot on the availability of the relevant tuning forks, since you need a different fork for each plane you want to hop to (including one for the Material if you ever want to get home, so two minimum).

The cost in gold is probably not a big deal at your level, but being able to obtain them is another matter. Check with your DM first about how tuning forks can be acquired in their setting and how difficult it will be to get them. If it seems like there's any doubt about how you can get them, I'd probably grab force cage - 1500gp in ruby dust is likely more easy to find than specially attuned planar forks.