I take it to read 209 primers are legal " Primers designed to be used in modern cartridges are legal" and nothing is mentioned forbidding in-lines. Just about any off the shelf ML will work. It is the number of bells and whistles that drive up the price.I have both a TC Hawkin and a TC Impact inline.I have killed elk with both .The Impact can usually be found for less than $300 as are few Traditions .
They all will shoot accurately enough with the right load and bullet .My only advice is to stay away from any brand that has plastic sights.