I'd stay away from the titanium screws, most I have seen are very soft and round quickly, not to mention th price
There is nothing wrong with Kyosho's hex screws at all (not the philips ones in the RTRs but the ones from the race spec kits) and I either use genuine Kyosho hardware or the stuff supplied by MicroTech depending on what is easily available when I needed it. I've had nothing but good results from both.