Firstly assume whichever full size awning you buy is a two person job to put up.
New then Kampa pop-air pro is difficult to beat for value and ease of use. You have a pre 2010 van so it should fit a treat, unlike post 2010 vans. They are about £900 new.
If you do not want an air awning and are prepared to spend an extra 20 mins when it comes to packing away then Fortex and Unico should be. at the top of your list. If lucky then £600 could secure a good used example. They are about £1,500 to £1,800 new.

Colin

A much cheaper alternative and perhaps more in keeping with an older van would be a Soplair. I'm not sure of the model for a Troll but here is a 'Bourgogne' fitted to our Triton. They are all similar in appearance and are made of heavy duty material which I think is called 'Tencate'.

Awning01.jpg - Bild entfernt (keine Rechte)

This picture shows the awning erected with front and sides in place and zipped up

Awning03.jpg - Bild entfernt (keine Rechte)

Here you can see it being used as a sunshade in hot weather with front and sides completely removed. In practice we tend to remove the front, half unzip the sides and roll them down for ventilation so that they can be zipped up quickly should the weather change.

I have seen as new Soplairs advertised on this forum for somewhere in the region of £150 - £250 so you could be lucky and pick up a real bargain.

Ours has the fibre poles which keeps the weight down considerably.

I have owned 2 Soplairs. I can testify to build quality, weather resistance, longevity and value 2nd hand. The steel pole model is strong but heavy. The fibre pole version lighter but the poles bend. The readily available end of pole bayonet fittings break.
We are still married but I prefer an awning that offers less chance for poles slipping out of location eyelets on side of the van leaving small dents.

Colin