Airflow & CPU HSF

[Hybrid SyntaX]

hi , i'm new here
i have a Thermaltake Blue Orb II on my cpu currently ... but i dont know why that's too hot ! (it should be around 45c right now ) and u haven't oc it even ...
i want you suggest me a good CPU HSF (i rather Thermaltake cause i can find it easily around)
btw i'm thinking about MiniTyp 90 , MiniTyp90 Value Pack or BigTyp 120
what's your idea ? r they good enough to cool my cpu at least more than Blue Orb II ?

and about my case airflow what do u think about it ? i have a Thermaltake Armor case with its stock fans (one front,blows the air inside ;two rear ,blows the air outside and one on top and it blows the air outside)
btw is that efficient to add another fan on front ? its better that blows air outside or inside ? or change its stock fans ?

at last sorry for my bad english and noob questions !