Equipment: moving from partial to All grain

So, OP update, this puts a new spin on my situation. I just won a $50 gift card to Lowe's. I'm a partial mash brewer wanting to go All Grain. Here's a pic of what I already have. 5 gallon kettle, 10 gallon gatorade "mash tun"(nothing special added, no false bottom, trickle pipes, etc.) a 5 gallon fermenter, bottling bucket. So what should I get next? Bigger brew pot? Apparently if you wait til after Thanksgiving, they're Turkey Fryers are discounted well. Or should I get another cooler to be able to fly sparge? I've been doing batch sparges... Without bigger kettle though, I'd have to do smaller batches until I got a bigger one. Should I make a false bottom? Any advise/thoughts/comments welcome. Thanks.