I picked up a fabulous Mothercare brand one with my first bubba (and it was half price at the time!). it was a three wheeler, with large wheels - great for off-roading. We do lots of walking, and in fact our bubba's first big day trip out was to the Highland Wildlife Park way up north in Scotland. Larger wheel size means the pram deals better with getting through gravel and eases bumps. Easier for managing stairs too - less rotations of the wheel, so less work.
The downside to consider with the three-wheeler prams is the size (and with some, the weight). We had a tiny car, and the pram folded well enough to fit in the hatch boot - and the wheels popped off with a simple one-button mechanism. But I would NEVER consider getting my pram on and off a bus! I'd rather walk for a day than deal with a 15 minute bus journey with that pram.
And now that I have bubba no. 2, the pram is no longer suitable. It'll do the job for now, as I can easily use the baby carrier for the little one, but once we move we'll switch to a pram which accommodates both of them. Bill and Ted's have some lightweight, sturdy three wheelers, which have attachments to accommodate a second baby.
So, it all depends on your budget and foreseeable requirements.
From a shopping strategy point of view, I recommend trying prams in-store to work out the features / brand etc that work for you, then check online for prices. Some stores have reduced prices that only apply to online orders, and you can also do an immediate price comparison.
Have fun shopping!!