I do not know if I, personally, would use the term " beginner" for your particular situation. A beginner to me is someone who is looking to get into the sport, has never shot, not to mention owned, a bow before and is looking for something to get started with.
On the other hand, I do not think I would call you an intermediate level shooter either as you have only recently been introduced to the sport.
Ok, enough babbling, to answer your question..it would depend on the model. Both the Liberty and Justice are reported to have silky smooth draw cycle because of the new cam/idler design. However, having not handled one yet myself I would hesitate in recommending it with your particular situation in mind.
What PSE bow do you own? A Nova?...or something similar to it with round wheels/soft cams? If that is the case then I would probably still suggest the 60 lb peak weight version of the Liberty simply because you will still probably get more speed out of it at 60 lbs with a potentially similar draw cycle. However, if the draw cycle does turn out to be stiffer than what you expected then you can always crank the draw weight down further. You will not be able to necessarily turn a 70 lber down to that level of draw weight.
But, if your PSE is a harder cam...Lightning Cam, etc... then maybe a 70 lb Liberty or Justice would be a viable option.
Hope this helps.