The best replacement for firth is zildjian.

The best alternatives to firth are rated as following:
★★★★★  zildjian
★★★★  promark
★★★★  vater
★★★★  finch
★★★★  west side
★★★  peugeot
★★★  fifth
★★★  farrell
★★★  matthew macfadyen
★★★  hugh grant
★★★  innovative percussion
★★  pro mark
★★  rupert everett
★★  matt macfadyen
★★  fjord
★★  extreme isolation
★  forth bridge
★  ahead
★  ferrell

Your alternative for firth is not listed? Suggest!
Speaking about firth, one probably shouldn't forget about michelle williams.

Other search terms related to firth and their ratings are:
★★★★★ michelle williams
★★ jennifer ehle
You have in mind a companion for firth and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of firth in all years. Click on graph for more.
firth
zildjian
promark