Linq select query Selecting an specific row. If it doesn't exist return FirstOrDefault. Is there a better way?

I have this linq query:

dr =
   (from avTable in DAL.DataStore.DSet.Tables["Values1"].AsEnumerable()
    join pavTable in DAL.DataStore.DSet.Tables["Values2"].AsEnumerable()
        on avTable.Field<int>("PK") equals pavTable.Field<int>("FK_Value")
    where 
          pavTable.Field<int>("FKI_ProductAttribute") == Value2 &&
          avTable.Field<string>("Name") == "Specific Value"
    select avTable).FirstOrDefault() ??
    (from avTable in DAL.DataStore.DSet.Tables["Values1"].AsEnumerable()
     join pavTable in DAL.DataStore.DSet.Tables["Values2"].AsEnumerable()
     on avTable.Field<int>("PK") equals pavTable.Field<int>("FK_Value")
     where pavTable.Field<int>("FKI_ProductAttribute") == Value2
     select avTable).FirstOrDefault();

I am trying to get a row if it has the desired specific value. Otherwise get the first or default.

This smells. Is there a better way to do this?

Clarification - I want to do something like this:

var dt =
   (from avTable in DAL.DataStore.DSet.Tables["Values1"].AsEnumerable()
    join pavTable in DAL.DataStore.DSet.Tables["Values2"].AsEnumerable()
        on avTable.Field<int>("PK") equals pavTable.Field<int>("FK_Value")
    where 
          pavTable.Field<int>("FKI_ProductAttribute") == Value2 &&
          avTable.Field<string>("Name") == "Specific Value"
    select avTable)

DataRow dr = dt.Select("PK = Specified value");
If(dr==null) dr = dt.FirstOrDefault();

and then do a select based on a specified value. If that is null, then grab the first or default. This seems to be more DRY. But is it more or less efficient...I don't know. Also, I have a hard time doing a select on the dt based on the specific value (lack of linq expertise and google prowess to find the answer I am looking for).