[Grotstompa]

You must have the Terminator Chaplain, Dreadnaught, the tactical squad from Battle for Macragge, and the Battleforce Box.

The battleforce box alone is 500 points with just bare upgrades. The BFM Tac squad is only 166 points. The Chaplain is probably around 125 or so and the dread another 115. That doesn't leave you much room for anything else...but a Landspeeder might come in useful. If you want to turn the Rhino into a Predator, just order the bits and save some money--that would also account for the extra points. Veteran upgrades on your squads will also account for the extra points without having to add any other models.

Rhino's are actually pretty good if you know how to use them and know what to expect of them. They can make the Tac squad 50 points better, easy.

Your army list looks pretty good as is. If you want to shake things up a bit, take the missile launchers out of the tac squads and turn that combat squad into a Dev squad instead of giving them close combat weapons.

Your list looks pretty good, though.