My experience: Getting into higher end gear I concluded that an integrated would be best. I figured I might eventually get to separate pieces, but only when (if ever) necessary. An integrated made sense to me budget-wise at the time. The one I selected was very well liked amongst users and reviewers. The main tipping point for me was that if I ended up requiring more power I could just get a new power amp and use my integrated's pre.
Not sure if this is true for all/many/some/few budget (< $2000) integrateds, but when I eventually did realize I needed more power I saved up and got a beefy power amp. I was VERY disappointed in the result. Turned out that though my integrated sounded great as an integrated (power + pre = very good, right?) the pre section sucked in separate use ... who knew?
My point is, if you decide integrated do not assume a great sounding integrated will sound as great using just its pre (or power) amp section. Not only was mine not great, it was less than acceptable.