I've already got the following on ebay:

1 Grand Master
5 Terminator Retinue

Cost: $50 even, (and it's nicely painted)

I'm thinking of buying the following:

11 IST: 7 hellguns, 1 flamer, 1 meltagun, 1 plasma gun, and veteran sergeant with plasma pistol - $25

4 GK 3 Stormbolters, 1 Incinerator - $20

Considering buying the following:

11 IST, one melta gunner one grenade launcher and one flamer $30

11 IST, one veteran with hellpistol and close combat weapon, one plasma gunner and one flamer $30

Which, if any, of the above listed lots, (not the termies, already bought those) should I get, and what else would I need for a balanced, usable, win-a-game-able DH army? I'm thinking I'd want a force of between 1000 and 1500 points.