I consider Phenom a bit overpriced for what it is. Both 100 and 300. Nice and all, yes, but this is for commercial reasons, not personal indulgence...
Eclipse pics from the web: looks extra tiny!! How cramped is it inside compared to Beech and/or CJ1/2?
Yes, the Eclipse is tiny. It's more a personal jet than your typical VLJ used for charter and/or corporate.
There's probably a good reason why the newer jets such as the Phenom 100 and 300 are more expensive than an old Beechjet They are cheaper to operate. The more you fly, the quicker that will pay for itself. They are probably also more reliable. Maintenance support may be better. You need to consider all these factors and more before making a decision.
Perhaps you want to share more of your mission profile? How many hours a year? What type of airports? City pairs? Pax count? Charter, corporate or private?