Guess Eric above gave you an estimate based on Japanese prices but these are not very realistic since those were sales at a moment when the market was flushed with Beasts and a lot of others were out so some of these might´ve slipped through for very low prices.
The pic is not very clear though since it would be impossible to tell if the shield is real, whether there is damage on the beak of the Hurricane (which it often has) and I think there´s a possibility your King Buster weapon might not be real since I see some kind of sparkle in the color which makes me believe it might be a TGB custom but this might be the result of the flash used. So with these uncertainties its harder to give you a fair price estimate but I´ll give it a shot.
IF the Strong Hurricane has no issues on its beak and both (gun and shield) are real you´re looking at a price of around $200-$250.
King Buster with real gun is worth around $275-$325 and up I recently sold one on Ebay with a more paint damage for $230 without the gun.
The Horn issue with the Seahorn is commonly known and also quite accepted because finding one without any damage is hardly impossible and I´d rate him around $125.
All estimates are based upon recent prices as well as sales in the past and it really depends upon the period and the availibility of some pieces whether you´d indeed be able to reach these prices when selling but under normal conditions prices like these shouldn´t be to far of.
If you can tell a little bit more about there origin it might also be more easy to see whether guns and shield might be original or not.
Hope this helped.
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