Get the best Roland kit (probably used) you can, it's a small budget for high expectations unfortunately.
The problem is, while the features and limitations of triggers (how many zones, how many inputs) all depend on the module/interface, the better ones are sold with the better pads, so you need to pay up. You can't just buy a set of great pads without a fancy module, and if you get a fancy module, you don't need the edrumin. But if you get a cheap, budget kit that lacks features, the edrumin can be the perfect upgrade, as it supports a lot of higher tier pads from various manufacturers, so you can add e.g. a few (Roland-copy) Lemon cymbals. It's also great if you have an A2E converted kit.
For 1k I'd probably look for a Roland TD17 used, maybe an Alesis Strike SE (unlikely) or a Lemon kit from Alibaba with Edrumin. It's a difficult budget, a little too much for a cheap kit and a bit too little for a good one.