Requires 15min and 5min data, avg 1.5 trades a day on equities. By latency I assume you mean penalty from being scalped by HFT in order execution. This I don't know and I don't currently have a data based method to discover this although working on it seems interesting. Hold time is usually a few hours, so it can hold overnight and that cost has been considered. All slippage, fees and margin costs have been considered.What is the frequency? Does it hold overnight? You said you used large caps for equities, right? How sensitive to latency? Minimum buying power needed for equities?
If I'm understanding you correctly by min buying power, you could easily implement it with 10k. You would not want to start taking positions larger than depth at best price since it would have a large effect on mean return.