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This is a list I'd really like to try out. The list has a bullet magnet (the lash prince) to help your rhinos close in. In some matches you will want to play conservatively and maintain the threat of the lash. In most, you want to force your opponent to deal with the prince. What makes this somewhat as good as wolf grey hunter spam is the survivability of the plague marines and the ability to use the obliterators to help swing combats. With an old codex like csm all units need to be used to the maximum efficiency. Deathstars should be ganged with torrent but most other units can be dealt with plague marines + obliterators. That's why I would often consider deep striking the oblits next to the icons, to come in and melta stuff (or plasma what drops out) and then support in cc with fist attacks. Just make sure the plague marines are protecting the obliterators from any fists.

Daemon Prince with wings, mark of slaanesh, lash of submission @ 155pts.

7 Plague Marines with personal icon, two meltas, champion with combimelta and power fist @ 236pts.
Rhino with combi melta @ 45pts.

7 Plague Marines with personal icon, two meltas, champion with combimelta and power fist @ 236pts.
Rhino with combi melta @ 45pts.

7 Plague Marines with personal icon, two meltas, champion with combimelta and power fist @ 236pts.
Rhino with combi melta @ 45pts.

7 Plague Marines with personal icon, two meltas, champion with power fist @ 226pts.
Rhino with combi melta @ 45pts.

5 Lesser Daemons @ 65pts.

5 Lesser Daemons @ 65pts.

2 Obliterators @ 150pts.

2 Obliterators @ 150pts.

2 Obliterators @ 150pts.

Total @ 1849pts.

The Lesser Daemons are for cheap fearless scoring. In a scoring role, fearless is huge. Unfortunately, reserves can screw you in some games. 4+2 is still very good. Loads of melta everywhere. You'd rather fight your opponent demeched. Don't be afraid to fire your meltas at long range. Suppression is good if it helps you close in for the kill. With such resilient marine units (t5, fnp and fearless) you can really start with your infantry deployed to give cover to your vehicles. There's a lot of tricks and with an army like this all units need to work together to win. Would be a lot of fun.