Build to reroll slayer/duelist into for delve depth 1k?

I leaguestarted static strike slayer. So far it's been excellent, it got me a mageblood already and got me to delve depth 500 but it's starting to show its limits now.

What build should I reroll to if I want to go deeper into delve? I'd prefer something that's not insanely expensive to get started but can definitely scale with investment, something around the budget of 100-150 div plus a MB. Or if I rerolled into another character would my delve progress be saved or would I have to take him all the way down here again too?