Oopss, N73 user searching for new phone.

Anyway, in my opinion, for:
1. Music & games: 3.5mm jack, overall better audio experience and N-gage of 5730 XM should be very good.
2. Great built quality and classy look: It's a E-series, classy business phone, very good built quality, nice look and a sense of class.

I personally prefer 5730 XM because I prefer musics and games.

It's a camera-oriented phone (as suggested by the Cybershot branding), if you like taking picture a lot, it should suit you.

LED - not as bright as Xenon but more battery friendly and can be used as video light on (but I'm not sure if C902 has this feature).
Xenon - very bright but very power hungry.

Your budget?

That only applicable to mere touchscreen, if your budget allows, why not go for a touchscreen phone with hardware QWERTY keypad? Like N97.

I already told you the pros and cons, for great brightness - xenon, for longer battery life - LED.

If you want a detailed review, you can read this review from GSMArena.

It seems like your primary concern is web browsing, hmm......

Let's consider this:
- Curve has a optical trackpad.
- B7320 - 1480 mAH battery, E63 -1500 mAH, Curve - 1150 mAH.
- B7320 - Windows Mobile, E63 - Symbian OS, Curve - BlackBeryy OS.

So I think it's all boiled down to your priority:
- Which platform do you prefer?
- judging from the specification, Curve has a optical trackpad which could aid your browsing experience but has a lower capacity battery compared to the other two.

I assume the Omnia you mean is i900.

What is your main usage?

For musics, videos and web-browsing: Nokia 5800.

For photographs, performance and documents: Samsung i900 Omnia.

Maybe you wanna consider Nokia N79? It has a 5MP camera, 3.5mm earphone jack and judging from the spec, the 1200mAh battery should be quite decent for a non-touchscreen phone. It is very thin and light for a smartphone (15mm thick, 97g). If I remember correctly, it is the most compact N-series to date.

I'm not sure what you mean by "keypads fade", is it the back light or the printing? I would guess it means the printing, I don't own a N79 but the keypad doesn't seem like those will fade easily, the printing of the keypad of my about 3 years old N73 has no sign of fade, as N79 is the successor, it should do better, I think.

But N79 would be a little out of your budget unless you buy AP.