NyA is a great centre and I love the longer trail it has a real wild feel to it and a great finish.
Would also add my approval to the ClimachX train just out of Machynlleth just for Tony The Tiger.
The guys at Holey Trail do have bikes for hire and PLEASE give them your custom, they are true Knights of MTB. They loaned me a rear shock, saved my weekend and declined any payment !!! All they asked was a mention here !
They also run a spiffing MTB bunkhouse right in the middle of Machynlleth which is very handy for all trails, pubs, cafes etc.
They also do MTB Guiding.
Check out their Website
REDITREKS