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Installation in an attic - well, you've read all the warnings on that - so best thing is just to try it out. No one can really give a good estimate of reception where it's not externally mounted. You're not too far out and have good LOS to a pile of stations, so that's in your favor. Start out at 315 and tweak it from there. Rescan for OTA channels on your TV and check out the signal strength of each w/your TV's diagnostic screen.
As for joining antennas with a reversed splitter, yeah, not a good idea. But now, you mention an HTPC. With that setup, say you have a dual tuner dual input HD Homerun, you can hook each antenna to it and let your HTPC manage the collection of channels from both. That's what I do.
As for the 8-way splitter, each connection should be terminated at least. Even better is to just split to the # of TV's you need to feed, so a good 2 way would be best. That way, you have less signal loss to deal with.
As for an amp, IMO, don't bother yet. Try what you get w/o it and then add if needed. You can check your signal levels with your TV's diagnostic screen to see what's coming in weak. Typically you'd like to see 70% or better.
Make sure the coax you're using is idle, as you can use it if it stills provides you internet.
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