ln my opinion it's not worth the trouble.l don't know what kind of sts were you looking at on ebay but if it's cheap leave it.Quality is probbably poor and therefore you wouldn't be satisfied with it.
1. if you buy it you lose some money
2. you have to instal it
3. you have to get rid of it when you buy ark sts
4. you repeat instal process twice
5. on the end you just end up spending more money and incur more unnecesary work
Just wait for some time until you have enough money and buy some realy good stuff like ark as you mentioned or TWM that folks here say is the best.You'll survive without it until you get a good one for sure :2_biggrin