Avoiding multiple if statements in C# factory method

I have C# application that stores data in a NoSQL database. The app has a repository class that uses a series of objects to translate the data from the NoSQL form to that used by the C# models, and vice versa (essentially a form of ORM). The objects implement a 'converter' interface, and each object works on one specific data type (string, bool, etc). Internally they use reflection to perform the transformation. Instances of these objects are created by a method that returns the object for the given type. Currently the logic looks something like the following:

if(type == typeof(string)
    return new StringConverter(...);

if(type == typeof(int) || type == typeof(uint))
    return new IntegerConverter(...);

... // and so on

However all those 'if' statements bother me. I know I could do something like create a dictionary to map types to creation methods but I am not sure if this will result in more readable, easy to maintain/extend code(?). Given the need to create the type abstractions what is the best way to go about doing this? Any suggestions welcomed. Huge thanks in advance.