Active Records vs. Repository - pros and cons?

Using ActiveRecord you might define a class like this:

class Contact
{
  private String _name;
  public String Name
  {
    get { return _name; }
    set 
    { 
      if (value == String.IsNullOrWhiteSpace())
        throw new ArgumentException(...);
      else
        _name = value;
    }
  }

  public Boolean Validate() { ... /* check Name is unique in DB */  }

  public Boolean Save() { ... }

  public static List<Contact> Load() { ... }
}

Whilst this is nice and simple, I've found my classes become very bloated with a big mix of logic going on!

Using a layered/domain design you might define the same class like:

class Contact
{
    [Required(AllowEmptyStrings=false)]
    public String Name { get; set; }
}

class ContactService : IService
{
    public List<Contact> LoadContacts() { return (new ContactRepository()).GetAll(); }
    public Contact LoadContact(int id) { return (new ContactRepository()).GetById(id); }
    public Boolean SaveContact(Contact contact)
    {
        if (new ContactValidator().Validate(contact))
            new ContactRepository().Save(contact);
    }
}

class ContactRepository : IRepository
{
    public List<Contact> GetAll() { ... }
    public Contact GetById(int Id) { ... }
    public Boolean Save(Contact contact) { ... }
}

class ContactValidator : IValidator
{
    public Boolean Validate(Contact contact) { ... /* check Name is unique in DB */ }
}

class UnitOfWork : IUnitOfWork
{
    IRepository _contacts = null;
    public UnitOfWork(IRepository contacts) { _contacts = contacts; }
    public Commit() { _contacts.Save(); }
}

How was it migrated from Active Record => layered design?

• Entity level validation in the Name setter => remains (ableit via a DataAnnotation)
• Business logic/rule validation (unique Name) => moved from entity into a new separate ContactValidator
• Save logic => moved to a separate Repository pattern class (also with a UnitOfWork)
• Load logic => moved to the separate Repository
• Interaction with the Repository is via a new ContactService (which will enforce use of ContactValidator, ContactRepository, UnitOfWork, etc - opposed to letting the caller loose with the ContactRepository!).

I'm looking for peer approval/suggestions for this layered design - I don't usually design outside of Active Record type! Any comment appreciated.

NB - This example is deliberately simple (the UnitOfWork isn't really used and the newing of Repository/Validator would be handled differently).