My name is indeed Ed lol.
We won't hold anything against you for being a pacifist. I won't anyway. To me, you're now like that cool hippy chopper pilot from Battlefield Bad Company 2 lol, you'll kill someone eventually if it's in order to save your awesome murderous buddies... Right?
Anyway...
Does considering yourself a pacifist mean you won't be planning on going to any airsofting games? If not are you aware of the UKARA scheme? Without a relevant defence, you can't purchase replica firearms in this country. That is, without being associated with an airsofting site, or being a member or a reenactment group. There's plenty of info about it all over the place, but basically, you'll have to play 3 days airsofting to be allowed to buy a gun in its real colours, otherwise, it'll have to be 51% a horrible fluorescent colour... =[
I'll let you mull that over in your own time.
Reputable airsoft manufacturers then.
Brand names in airsoft with regard to guns tend to be viewed in terms of their realistic imitation of the real thing and their reliability as a firearm in their own right.
Most pistols are powered by gas and this performs less well in colder temperatures, so here in the UK airsoft scene we could certainly have a better time with our pistols, especially in the colder months.
Plastic replicas of real, metal guns obviously lose a few points in the realism side of things, but they gain them back in terms of performance when the weather gets cold as plastic doesn't get cold as quickly as metal, nor does it stay cold for as long once you warm it up.
Metal guns are more realistic, but suffer from poorer performance when it's cold.
It's mostly down to personal preference which you go for as sidearms rarely get used anyway unless it's a pistol only game you're playing.
Tokyo Marui, or "TM" are generally the most highly praised and reliable pistols but they're plastic.
KWA and KSC are both metal and good performers, but expect to pay for it.
KJW and WE are metal and not so great in terms of performance, but for garden use you'll get by. I have a KJW Sig Sauer and I love it, but it is pretty useless from about September to around April.
If you buy a pistol that uses bottled gas, then make sure you always leave some gas in the magazine when storing it, otherwise the gas seals will stop working and as a consequence, you'll be left with a pretty paper weight until you buy more magazines.
If there's anything else you want to know that you think I might've missed then don't hesitate to mention it, I'm pretty much living for airsoft right now so I probably have a tendency to overlook certain things because I'm used to them.
To sum it up, if you're just wanting something for shooting in your garden, then look to spend between £100 and £150 and you're bound to be happy with it. Anything less than £100 will be made using parts with poor tolerances and the trigger mechanics will wear out quickly, the magazines will leak gas and the performance in terms of range and accuracy will be poor, to say the least.
Edit: Thought I'd just mention this as well, you might be unaware of it, but you can also buy CO2 air pistols that are blowback.
I used to have a Walther CP99 Compact. They're less realistic than airsoft guns as the magazines are like lolly sticks and the slide doesn't lock back properly, but they're far more reliable and not to mention, destructive against coke cans and stuff. You can also (because the law works in mysterious ways) buy them with no form of defence whatsoever and in the same colours as a real one! Ammo is about 6 times more expensive though...
It's up to you, I can't pick for you, sorry!