The lh1000 is a fine head. great sound, but limited as far as range of tones. If you're a knob twittler you may wanna look elsewhere. And, unless you plan to run two 4 ohm loads or bridge it for the full 1000 watts@ 4ohms then you may as well get an lh500, it's the same thing, the 1000 just has 2 500 watt power sections.
You could get a million suggestions on what amp to try, best bet is to buy used, so when you decide you wanna try something else it doesn't hurt so bad.
I myself have am currently using an ampeg pf800, and I would certainly recommend it to anyone.