Hi, if you're planning to fill up a 19" rack with separate rows, this is the solution that works for me, in case it helps you:
- Tiptop rack ears (two pairs) €40
- Tiptop 84HP rails (two pairs) €80
- Behringer CP1A (one) €60
You may need an extension flying bus as you fill the rows, since the CP1A provides 14 connections. Other than that it works perfectly for me at roughly €1.1 per HP.