I use Elna Silmic II pretty much everywhere, except where the caps get obviously too hot, in some of the higher power amps / receivers power supplies.
In the 2225 I would not hesitate to use them in the power supply board as well.
For the main filter caps I like Nichicon KG. (the KG series comes in three quality grades, I and II are called Gold Tune, the best ones, III, are called Super Through)
What's nice with both of these series is that they are pretty much the same size as the old originals.
And yes, I also usually replace the smallest (0.47uf, 1uf, 2.2uf... ) with films (wima mks2 or panasonic ECQ or ECW)
After a recap I find the sound much improved, quite obviously so. Sometimes the recapped unit seems too bright at first, but that usually changes after a few dozen hours of play.
Also, if you spend the hours necessary to build a parts list, make an order, do the work....it's worth puuting in very good parts. I'm not saying the most expensive boutique stuff you can find, but just top quality but "normal" parts from reputable providers. Ebay sellers apparently offer many many fake parts, knowingly or not. So better stick with known good sources... Partsconnexion, hificollective, mouser, digikey to name a few.
This is my personal first-hand experience. YMMV....