Knock it off. You're wasting everyones time. Pick a budget, state your budget, and stick to it. This back and forth crap is really obnoxious. Also, why are you concerning yourself with multi platform support when you're wrangling with 8 year old hardware? If you're going to upgrade, then wait. If you're not going to upgrade in the next couple months, get something to suit your needs.
The people at "the store" clearly have no idea what they are talking about. You mentioned before you were "buying from a friend", now youre "buying from a store". Pick a story, state your story, and stick to it. You have people with a TON of knowledge that are willing to share it for free, and you can't be bothered to stick to a single series of events. Stop wasting their time.