The tantalums I used were under 50 cents each. Arguably superior multilayer ceramic chip capacitors are around 80 cents. Those have the advantage of being non-polar and are potentially a bit more reliable than tantalum. I can poke around on Mouser this evening and find some links, but I just bought the same tantalums that were posted on some Mac re-capping page I found on the net. For what it's worth, I haven't yet found a bad through-hole cap on a Mac logic board. My policy with those has been to test the ESR, and if it checks ok (as they all have) I leave it alone. The through-hole caps that go bad are the really highly stressed ones in the power supply.

Any number of different parts will work here. The applications that used the SMT 'lytics are non-critical, they had to be, even when new the old caps had terrible specs, ESR of 10+ Ohms was not uncommon and that's with a brand new part. My reasoning for using more reliable parts is that each leakage damages the board, and each replacement risks lifting a pad or tearing a trace. When working with stuff that isn't made anymore IMO it's worth a few dollars more to do it once and be done with it. It's still only about 5 bucks to re-cap the whole board.