The ridership modeling PTV did that was posted a while back assumed 8 stations including Lougheed. The two stations that were in that study but missing from here are Lincoln and Queens.
Lincoln: Definately should be built right away, it's right in front of the Mall, and can serve as the main station for the expansion of Coquitlam City Centre. The City Hall/Douglas station could then be placed on the Northwest Corner of Pinetree and Guildford, there's just a parking lot there right now (for a swimming pool I think).
Queens: My hunch is that this would be the least used of the three potential Port Moody station, since it would likely only attrach people in the immediate area. PMC would get cross over with WCE traffic, and Ioco would serve all the high density development just to the North.
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Stations from LRT era that were axed:
Cameron: I've had a bit of a change of heart about this once recently. It's pretty close to Lougheed mall, but given the density built/planned, it may be worth it anyways. It would be expensive to build in the median though, but cheaper on the side of the road. Burnaby really wants this station, so I'd offer them a deal: We'll build/make future provisions for it if you let the guideway run up the western side of North Road rather than in the centre.
4th Port Moody Station: No thanks, three serves the area well enough IMO.
Falcon: It's not really all
that far from Ioco, although without it, I think people in between Falcon and Lansdowne are going to have to take a bus to get to the station. Note that the conceptual LRT drawings on the first page of this thread actually shows the station at Lansdowne. However, given that half of this area is parking lots, I don't think the station would really be busy enough to justify its existence. Who knows, it may get built anyway, due to the station name.

Sort of like how the final station on the Millenium Line is located between Glen St. and Clark St.
4th Pinetree Way station: Again, not really needed. Essentially, they would be splitting CityHall/Douglas into two stations; one right at Guildford, and one right at Douglas. Convinient, but not really nessecary, it's a 300m or so walk from a station on the north side of Guildford to Douglas College, those students can handle it; heck, some classrooms at UBC manage to be 600-700m from the Bus loop.
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Personally, I'd keep the core stations, throw in Lincoln, build one of Queens or Cameron, and have the other as a future station.