I've been intrested in getting some Fu Manchu dvd's but I don't know which ones to try out first , any recomendations would be appreciated.

I believe all the Fu Manchu stuff has been released now.

MASK OF FU MANCHU(1932?) with Karloff is part of the Hollywood Legends of Horror set. It's old but probably the best.
THE DRUMS OF FU MANCHU serial is available. One of the better serials. More violent and less juvenile than most. Republic had trouble getting this released because the Hayes code wouldn't pass it because the villian gets away in the end.
The first three starring Christopher Lee FACE,BRIDES,VENGEANCE OF FU MANCHU are available in R2. Warner Bros./Seven Arts released these and are pretty good. Kind of like Hammer movies. The first one, FACE OF FU MANCHU is the best with Nigel Green as Nayland Smith.
The last two Lee films BLOOD and CASTLE OF FU MANCHU are available. These are spanish films directed by Jess Franco and the worst of the lot.

A good assessment. "Mask" is my favorite of the bunch, and is part of a newly released box set (along with some other movies of the era). It's pre-code, so actually stronger in content than the much-later movies. Beware the Jess Franco movies ... they're terrible, even by his standards (though one of them made a good MST3K).