With Redi....you can go to INCA, ISLD, ARCA, individual MM"s....all ECN's. Remember REdi is a Platform as well as an ECN. Don
You asked how many stocks. Our best traders trade 3-6 stocks, all big cap listed....perhaps 20-50 Opening only stocks.... Don
I see...although ARCA, ATTN and LPSD are basically useless pieces of shit....LSPD is pretty good for locking the market. Guys that hold the market with ATTN at my firm literally get beat up. It has ruined a number of stocks (ATTN, BRUT to some degree as well)