I have a list of items 

**ItemName Manufacturer TopSalesUnit**

```
Item1     A             100   
Item2     A             80                      
Item3     A             60
Item4     B             70   
Item5     B             50   
Item6     B             30
Item7     C             10       
Item8     C             05

```

I would like the records to be ordered so that the highest TopSalesUnit item is shown first, then the next highest item from a different manufacturer is shown second, then the next highest item from
a third manufacturer is shown, etc.:

**ItemName Manufacturer TopSalesUnit**

```
Item1       A             100    
Item4       B             070
Item7       C             010 
Item2       A             080
Item5       B             050 
Item8       C             005   
Item3       A             060 
Item6       B             030 

```

How to write a query in T-SQL to achieve it?