I bought today and plan on holding for a pretty long time. I'm very bullish long run on btc. I've been around long enough to know bitcoin has gone through way too much shit and rebounded from all of it for it NOT to be taken seriously.
If you are in it for the long haul, you almost certainly bought in cheaply today

In consideration for long term, I would say that buying into btc now is cheap. So, I agree with you. But as to whether or not the price is going to dip further within the week, its possible it might.
Yes, I agree with you, short term you may see a little dip, or maybe even a big dip, but if you don't need immediate access to the cash then it's obviously ok. You can always load up on a few more if the price drops again significantly, and you will break even when the price rebounds back to original price