Question about cheap VPS server with openSuSe

I plan to order VPS server to put on it some websites - around 15 small sites with a little traffic and small databases. I want to use it with openSuSe. Today I see one big 50% discount from this provider -
I plan to take the smallest VPS for $10. My questions are:

  1. What type ot virtuallization do you think is better - openVZ or xen?
  2. Do you thing 128MB or 192MB of RAM are enough for web server with openSuSe 11.1? They have it in the list of OS.

I have used web server on 384MB and it is OK for now, but 128MB on xen…I’am not sure.