Hi there, budget is definitely the 1st consideration! I think generally most travel systems are over priced and many wont last very long to justify the money, so if you are on a tighter budget I would try ebay, there are many 2007 and even 2008 model travel sytems on there for slightly less money (although bear in mind it's recommended to buy a car seat from new).
Oh, and it's worth thining about your mode of transport like will you be on public transport a lot, or driving a lot or walking everywhere! That way you can get the right size and weight for how you use it.
After doing weeks of research on what I needed, I too went for the Cosatto Cabi like Tiggertea. It had the 'lie flat' pram/carry cot option, car seat, pushchair option for later - which you can have forward or rearward facing (great for eye contact and security for bubs), also most packages come with hood, rain cover, change bag, change mat, shopping basket, cosy toes and apron. It was also lightweight, stylish and had 4 wheels, which I seem to get on better with!!!
It's a minefield out there! Like others have said, it's really good to get a feel of them by visiting a store and having a 'push' around.
Good luck xxx