The internals look like an inverted board-layout of the Antec PP303X, many of which I have recapped. Just make sure you use some nice, name-brand caps such as Panasonic, United Chemicon, Nichicon, etc. You don't have to use low-esr, (and in the case of PSU's you don't necessarily want to because too low of esr can affect how the circuit works in the PSU) but I would use something a little more low-esr than general purpose caps. And make sure you get 105 degree caps, not 85's.
In my case, I recapped a PP303X with (IIRC) Panasonic FM's and FC's. I've also used Samxon capacitors with good success, but those aren't as common to come by. Most people will tell you not to bother with the two, large filtering capacitors, but I always replace them, anyway with Panasonic TS-ED's which have very high ripple handling. Let's face it, the PSU is the core of your system--it affects how well everything else in the system works so why not make it super-solid?! It will also alleviate some of the ripple which reaches the CPU's filtering caps on the motherboard.
Back in the day I had an Asus P4PE which was running on a recapped PSU, and I opted to recap the motherboard with polymer caps (because I had a mess of them to repair motherboards in the future) and when I threw the board back in the system and booted back up, the system was always snappier at everything it did. And believe me you, anything to make one of those blasted 478 P4's run snappier was WELCOME!