No probs - sorry, I didn't really look into three wheelers, but if you go to this site:-
http://community.babycentre.co.uk/groups/a3859035/the_doubletriple_or_more_buggy_review_board
and start a new topic (or trawl through their old ones, you may come across someone with the same questions), the ladies are very helpful - they helped me to choose the select.
Personally, I'm not a fan of three wheelers, as I mainly use the pushchair for town etc, so just wanted something stable and which folds pretty compact. What I would recommend, is that you go to this site and post your initial question - there may be other options out there that these ladies have heard of - and they may have another one or two to throw into the mix. The thing that I've realised whilst searching is this:- There is no perfect double, and also, what is right for one person is not right for another. The things to include when you post is info on
1) Where you will mainly use it (town, walks, beach)
2) If you will be folding it a lot to put in a car, and does it need to be a small - folder (depends on your car)
3) Do you use public transport, so does it need to be one of these?
4) Are you set on tandem (front/back) or would you consider side by side?
5) How old/large is your toddler (I've heard the peach and possibly pear are outgrown quicker than some other prams
This one may be an option (I have no idea what the design etc is like, but there may be similar better quality ones out there - interesting as you can have side by side and choose the facing direction
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=150459938058&ssPageName=STRK:MEWAX:IT
Have looked on the forum at the top and they have some topics about it, and it seems the seats aren't that big though... http://community.babycentre.co.uk/post/a5970085/first_wheels_city_twin?intcmp=SPGroupSearchResult_SPGroupSearch_textlink
I know you wouldn't need both carrycot bits, but have shown you thread so you can see...
I think that's the main things to list so that when people advise you, they know exactly what your criteria is!
I hope you find your dream pram!! I'm sure that if you post help wanted on there, that someone will be able to advise!
R*