i have the 1200w one from nick.
Its ok with gutter that arnt too bad but its really slow bordering on poope with any amount of debris to shift.
In hindsight i would buy a 3000w machine if doing more than 1 or 2 jobs a week, but for the odd use its ok.
Ladders would be quicker in a few situations, depends on access and whats in there, would be good to have both.
oh, i would get carbon pole if you can, alloy is hard work, especially in the heat, it can be exhausting.
As for pricing, well thats down to what you can get, i would struggle to get 100 quid for a 3 bed semi, i tens to charge £15 per side, so £45 for a 3 bed, but this is still a good rate imo seeing that they take on average under an hour.