Rab's Bergen Pant made with eVENT and featuring 3/4 length side zips (340g/12.5 oz manufacturer's weight) is on sale at a number of online retailers in the UK. (Try Tower Ridge, for example).
Their lightest eVENT jacket, the Drillium, was on promo sale earlier this year, and could be had for about US$200 delivered. UK Sellers will normally deduct 17.5% VAT from the price for shipments outside the EU. A pair of Bergen pants delivered to Taiwan cost me something like US$170--quite a bit less than the Integral Design eVENT Rain Pants and other similar offerings from Montane.
I have not yet seen the Bergen pant, but RAB's clothing is always well designed. The Drillium jacket that I got this winter fits very well. I cannot compare it to the recently reviewed Montane Quick Fire, but saving over $130 made the choice a no-brainer. I'd think the same would go for the Bergen pant.