The OP is still planning so...
If you could wait a bit, probably to the week after the Black Friday, DrsFosterSmith usually have filters at 50% off. I bought a 2217 with full media for $80 which is so far the best deal in filter I've had. For my 180g, I currently have 2x 2217, 1x xp3 and 1x 2215 with 2217 impeller mod. If I didn't already have any filter, I'd buy 4x 2217's for my 180g for $320 with a big sponge filter and be set for a very long time trouble-free.
If you could wait a bit, probably to the week after the Black Friday, DrsFosterSmith usually have filters at 50% off. I bought a 2217 with full media for $80 which is so far the best deal in filter I've had. For my 180g, I currently have 2x 2217, 1x xp3 and 1x 2215 with 2217 impeller mod. If I didn't already have any filter, I'd buy 4x 2217's for my 180g for $320 with a big sponge filter and be set for a very long time trouble-free.