What to upgrade to next a 570 or 501?

Hey there guys,
I am thinking of upgrading to a newer model Berg.
I absoloutely love my 04 FE550 and have considered this a few times , then I ride it again and cant come to sell the bike I have , one twist of the throttle and some tight twisty single track, I love it.

My thoughts are between one of the last of the FE570 or hold off and look at a 2014 FE501. I like big bore 4 strokes as this is all I ride.I have not heard to much of the new 501,due to me not keeping up with the latest stuff, are the suspension improvements leaps and bounds ahead of the last FE570 , I realise they are 2 completely different bikes.I have ridden the 09 bikes a few yr ago and was impressed.
I might see if I can test ride a 2013 model and see what they are like first.
Has anyone got a review of the FE501 ?
After 12+ years on husabergs , I may as well go another one.
Any thoughts on this would be appreciated

Yes they appear to be both great bikes,
I quite like the bang of the 570 , however a lighter bike appeals , especially if bigger tanks are avaliable to. I dont race to much these days or use all the power of the bigger bikes , so maybe the 501 may be the choice especially with updated setting on the new type of fork.
I tend to like the weight also on the front end , although on the first ride on a 570 speed was the same without even getting used to the bike, with the weight focused back on the bike.Apparently the 501 motors are very strong and will get plenty of hours out of them also.
We will see.