I looked and looked at reviews of pushchairs and the like before hitting the shops to try the ones I'd narrowed it down too.
I made lists (
I'm a list-a-holic!)
What was essential to us (ours was for it to be able to convert from a single a double)
Then what was desirable but not essential (one handed folding, size etc)
Then there was an "if money was no option we'd have" list.
So using reviews and word of mouth I made those 3 lists, then we decided on a budget for everything over all (cot, pushchair, car seat) And then worked out budgets for thing individually, MIL kindly has offered to buy the cot, FIL gave us a voucher for Amazon which we'll use to get the car seat which left us with our pushchair budget for everything we wanted, including any accessories.
Then I cross matched that budget to our 3 lists, struck off any thoughts of anything more expensive and was left with a couple of options.
Then we went into town, looked in all the bog baby stores, mothercare, babies r'us and John Lewis, when we saw the Phil and Teds sat there on display I noticed it was priced as just the single unit but stated it came with the double kit and carry cot, I asked the sales assistant who said that it was wrong but her manger said if we bought it today they'd honour the price advertised for the lot, it was out of stock but they kindly agreed to keep it at that price and deliver it when it comes in stock next week to our local store. 
I had a push of it and played about with the various options of seat positions and it seems like everything we wanted within the budget we had set so I'm quite happy with it.
Now we need a car seat for £100 or under, I'm hoping to find a maxicosi but I've not looked.
I've swapped a lot of DS3's more boyish baby clothes for girls baby clothes and we still have the swinging chair from when he was a baby that I'll get out and use.