Is there a Query-Mapper like iBATIS.NET but with dirty tracking, lazy-loading and cascading updates?

Question

The problem:

1. A DBA-controlled database with a Stored Procedure-only mandate.
2. An expectation that the domain be defined in POCO's.

So I decided that I need an ORM designed for stored procedures and/or legacy databases.

Ideally the ORM should allow me to declaratively (or fluently) map domain objects to CRUD stored procedures.

Some findings thus far:

1. NHibernate would work if only I could control the queries that are generated for lazy-loading.
2. iBATIS.NET would work perfectly, but I can't find any examples of:
   1. object state tracking (new/updated/deleted/etc)
   2. parent/child commit transactions (if a parent is updated, update all dirty child objects as well).
3. An In-House developed ORM that works with our database conventions is an option and we have already started with this. But I want to make sure we don't have any other choice.

Non-Options:

1. SubSonic does wrap stored procs, but it doesn't map between procs and entities. I could implement a mapper of some sort if it came to it, but there are other factors also weighting against SubSonic, such as lacking VS2005 (or SharpDevelop) support and mingling data-access with domain objects.
2. Dropping the SProcs is not an option. Data integrity is a HUGE concern for the DBA's and the higher-ups and they feel safest with SProcs. It's not my place to convince them otherwise.

Does anyone know of an ORM that suits my needs, or a way to overcome the limitations in an ORM that doesn't suit my needs 100%?

Any suggestions welcome!