Piping hydraulics and their interaction with the pump are somewhat complex. In general, you won't hurt yourself with 2" pipe . . . but ironically, if you keep your system simple enough, some special design elements may be needed. Contrary to what most people think, pumps overload on high flow, not high pressure.

Look through the equipment list above and the associated costs. They include a link to a Pentair LED light . . . but I'm not ready to recommend those. LED lights *should* last a long time, but Amazon reviews, and reports here, suggest that far too frequently, they fail after a short time. I need to find out why. It may be voltage surges.

Look at the 'Sheer Descent' too. That's an attractive feature option for a small pool, but it MUST be on a timer: running a waterfall more than a few hours per day will screw up your chemistry, because of the constant aeration. The Intermatic timer listed will allow you to run the pump HIGH/LOW/OFF, co-ordinate with the Polaris ON/OFF, and operate a small water feature, like the Sheer Descent (ON, when the pump is on HIGH). However the wiring is too complex for most non-industrial electricians, and must be drawn out in advance for them. Also, use of a complex timer (with electronics) MANDATES installation of high-grade surge protection.

The starting place for you is to assess the pool layout, and what features are important to you . . . and how much budget room is left over, once you have the complete shell and inground plumbing. Once you've done that, you can look at final equipment and feature selection.

Let me remind you again: Pentair equipment is NOT an option if (a) you buy the equipment yourself and (b) the warranty matters.