Everyone is different in their approach. While it's nice, at first, to have your dog sleep with you in bed, it does get old. Even though Vizslas are medium size dogs a bed can still get very crowded. And depending on your lifestyle this may quickly become an issue - try explaining to a spouse, partner, gf/bf that they have to make room on the bed because you're going to be getting company.
So the decision is one of personal preference, but I will say once you let them start sleeping on the bed it's hard to get them to stop. Also, if you work or won't be around for long periods of time during the day I recommend that you don't crate your dog at night. 8 hours at night and then additional time during the day is really too long for a dog to be crated. Feeding them in their crate is a great way to make them feel more comfortable in there, if you feel like you have to make them sleep in their crate to start out, you may want to try and leave the door open so they don't feel trapped.
Also, puppies really aren't going to sleep through the night anyway, so if you're getting an 8wk old expect to be getting up every 1-2 hours to take him out in the beginning...