I'd say Perle, have done before and works quite well with this hop imo!
It's a great all round hop that gives you a smooth balanced flavour, aroma and bitterness too,
I'd suggest adding 10g @ 30 and 10g at 5 minutes, but 15g at 15min will be fine too, just less hop flavour,
Another hop you can use is Czech Saaz which won't give you much more bitterness and i find is not a really versatile hop like Perle!
Btw what kind of beer are you going for here?