sql select order by priority

Hi I have a table

id | custname | catagory | keyword
1     jack         |  cat1       | bikes
2     bill           |  cat1       | cars
3     frank       |  cat2       | bikes
4     john        |  cat1       | cars
5     joe          |  cat1       | cars

I need to select the top 4 based on priority of keyword.
If keyword has bikes then select (cat does not matter)
If there are 4 with the keyword bikes that is ok
If there are only 2 then the rest should be added by cat

My result should be
id | custname | catagory | keyword
1     jack         |  cat1       | bikes
3     frank       |  cat2       | bikes
2     bill           |  cat1       | cars
4     john        |  cat1       | cars

My statement look something like this: but does not order properly

SELECT TOP 4 id,custname,catagory,keyword
WHERE (keyword = 'bikes' or catagory='cat1')
 ORDER BY keyword, catagory, id,custname


Thanks In Advance