As i don't have any sponsor yet, i think i'm able to play on many different rooms.
When i will succeed in my poker game i guess one will offer me to play for them, so i will only have one room on my pc.
Until such a day (may be real far tho) i think that it's no big deal to download a new room, even though i have too many one's on my pc.
4king is really on top with a large field of games and players through many different rooms. Try PKR as your german, you'll probably will enjoy it, even if it's the longest poker download i've ever seen.