That sounds like a sweet combination! I am no expert, but I use a tamper with 15kg pressure spring and it works well for me. Previously I was having trouble getting the tamp/grind/dose equation right, and still have not perfected it - but at least now the tamp isnt one of the variables. I bought my Eazytamp from the same auction site - but it was a second from an Australian company and only cost $40. Luckily the size was spot on. I would say that the most important thing is to have a tamper that fits perfectly in your basket.
Good luck - I hope you have a lot of fun when your gear arrives! :)