Well, a good primer to this question would be this:
1. What do you have in your Ogre army?
2. What do you wish you could have in your Ogre army that's not well supplemented by the Ogre book?
At 750, it's still pretty small, so it's a tad harder to see the fullest potential of a paired army. I'd say it gets a little more interesting at the 1500each/3k point, but of course I know you're growing into it!
...That being said, I'd go with this; looking at the five armies you've listed, I'll throw my two cents in for each.
Tomb Kings - Great fluff, but unfortunately one of the weaker 8th armies (or, at the very least, one of the more complicated-to-make-work armies). They have access to some magic that Ogres don't have, but the Lore of Nehekhara is a bit wonky in its use (it can single-target any unit, but the bubble-casting only affects TK units...), Lore of Death is already in our roster, and Lore of Light can be good (but we'll get to that later). Shootingwise they're okay, but nothing that I think we can already do better via Leadbelchers. And at 750 you're not going to get access to the TK toys that could really help them be great.
Skaven - Tarpits and nasty warmachines. You can squeak (ha) in one WLC and some large packs of clanrats or stormvermin or whatnot, but if you wished to go this route, remember that Ogres are M6 and will be outrunning any tarpits that you use. Magic-wise, they're alright, and their shooting can be either really good or really bad. Probably not the "best" if nitpicked by those more experienced than me, but you could make it work.
Empire - Now, I've been doing a lot of research into Empire (as I'd like to start them as my second army), and I think they'd be a great pair-off for any army, including Ogres. They have a lot of tools that they can use to tailor themselves to fit any situation. If you want the most versatility and variety to support your Ogres, Empire can do that. Want a lot of shooting? Cannons. Want a lot of magic? Wizards with access to any basic Lore you want. Want something silly? If you're allowed to, have a warpriest on horseback riding with your character bunker, giving them Hatred and all the prayers (I mean, they'll be different footprints, but they'd just sit on the side of the unit, right? Right??). You can do a lot with Empire, but the best thing would be to use them to cover any weaknesses you feel that your Ogres have.
High Elves - I think that these guys can actually be a good pairing for Ogres. High Magic has a couple of good augments that can help the Ogres out, as well as that Drain Magic that can help debuff any enemies that are against the Ogres. Also, they too have access to all the basic Lores. Their shooting is good, and they can do quite well in close combat if they're kitted right. Maybe not quite as versatile as Empire, but they can be made to work, too.
Dwarves - I have about 1% knowledge of Dwarves, and less now due to the new book. From what I can ascertain from batreps and random forum posts, though, makes me think that Dwarves, although much better now, may not be the best fit for Ogres. Unless you go gunline Dwarves, which would be quite dull. They have Gyrocopters and bombers, but I don't think they fit any niche that we need help in (Sabres great with chaff/redirect, MFC great with T3 infantry hordes). I've already said more than what I fully know or understand, but I'd say, if you want to you can try, but they may not be the "best" fit.
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Ogres are a weird army to pair with, because of how drastically different they are from the rest of other armies. A primary Monstrous Infantry force with average Movement 6 and good buff magic? It's funny, I see them more as being the supplements to
other armies, not the other way around

33 Gnobs! Over 3 Packs of Trappers! Woot!
Gibblet, Nibblet, Crunchybit (from Slaughtermaster achievement)
New book WLD: 20/10/2 - Yay tourney wins and random game win!