What's your budget? Some good ones... Multimatic, Ohlins, Moton.
I went with hotbits
because you get the customization ability of the (above mentioned) high-dollar systems with durable (Race proven) quality and most importantly local GTA service (no waiting 3 months for Koni to send your back from a rebuild).
If you're looking for a good set of low-budget coilovers, check out HSD
or BC Racing
.. both a good set of mono-tube (much better design over twin-tube) sets sold by JRP & StanceFactory (respectively).... both capable of shipping to Ottawa.