With your motor I'd personally go with rigid frame and fork out for a Suntour NCX or thudbuster - If you want all suspension with motor it would be best to save hard and buy OEM but you'll be look at £3000+ Voodoo, Vitus, haibike etc, not my forte though I was lucky to remember a few names. The trouble with full suspension "normal" cheapo bikes is they are not really built for much unless you pony up a few quid, then fitting a kit motor to a high end bike would be in most eyes a waste.
I tried cheapo front suspension and even though it was suntour it was carp. I got a an NCX and went back rigid, there is now less to go wrong, I do gravel and potholes and manage well enough tbf, big tires can help also.
I tried cheapo front suspension and even though it was suntour it was carp. I got a an NCX and went back rigid, there is now less to go wrong, I do gravel and potholes and manage well enough tbf, big tires can help also.