A lot of good points made there by RichardMEL, and trying to pretend I have something to add, a few things you might want to consider:

* West-bound RTWs are more fun, usually more daylights flights. Any 40USD/night hotell beats any flat bed I've tried in C (and the only good one in C I've tried is BA, which isn't even*A). West-bound RTWs usually means a lot less jetlag and less need for adjusting your body clock.

* Even if you want to avoid going into the US, you might want to snip through it quickly to get a better selection of carriers. Instead og either doing South America or doing AC you could fly into a place on the US west coast and then transit out to Asia, i.e. inbound to SEA, SFO or LAX from Europe with LH, SK or others and then fly out with SQ or NH. You might choose UA, but I have a healthy dislike for them.

* On *A and C-class service there are a few things that people here may or may not agree on, but in my head I have a rough division of C-classes:

- SK: smallish carrier, nice long haul service, new aircraft, nice concept, good food. Friendly service, and CPH is a nice airport.
- BD: small carrier , but lavish service.
- SQ: A lot of show about the service, some people hate the SpaceBeds, I like the old ultimo seats (now gone, finally?). Big pluss for Book The Cook. Service reputed on some sectors ot be hit and run.
- NH: Haven't tried it, but according to some gossip in the trip report forums, it's aparently at least up to SQ standard on service, and even better on food. I'm trying my best to get SFO-NRT and a regional Asian flight on NH for my next ticket.
- LH: A must for UA.lovers; matrons that will tell you exactly where to sit and make you feel guilty for it. Done LH long haul once, not happening again.
- UA: not happening if I can help it, maybe a domestic SEA-SFO if the weather isn't nice for dricing down to catch NH to NRT.
-NZ: old C-concept, I think I read their redoing it later this year, but for now, oldish chairs that are actually comfy, but they make up for it with food and service. Sun-rise with the panoramic view in the AKL lounge is spectacular.

*A and lounges and airports:

-Avoid LHR like the plague. If you do get stick ther,e however, the new *A joint lounge is supposedly nice. If yiou are dependent on a more quiet lounge and nice good internte connectivity, the SQ lounge fits the bill.

-FRA is almost as bad as LHR, and using FRa usually entails using LH in some way.

-US domestic lounges are to loungest what US domeste F class is to real F class. Subsititue "holding pen" for lounge in the US.

-NZ lounge in AKL (as aboce), best view for taking on a good breakfast.

-SQ SilverKris lounge in Singapore doesnt have much in views (large TVs and aquariums), but half decent food and good snacks.

-SK-lounges: IKEA catalogue, nothing fancy, but has style and they're usually friendly places, but dont expect to be fed a lot.

-SIN airport: bar on the rooftop, say no more, cold beers, big shiny metal tubes flying in front of you. Heaven.

If you have the mileage, have fun:

-SQ on SIN-KUL-SIN, get a seat in the far back of the middle section on a 777, it's only 40 mins each way. That way when friends berate you for traveling upscale and being fancy you can comfort them with "I've traveled multiple segments stuck in the middle section of one of those big aircrafts". Makes you appreciate the SilverKris lounge more when you ahve to leave it for two hours to mingle with the unwashed masses.

-Get a latin touch to your ticket, RG is bookable on CDG-AMS and LHR-CPH and v.v. a few days a week. Short hops in big aircraft. Almost as fun as takeoff in an almost empty SQ 747 from SIN to CGK.

I'm hopefully getting away form work early this summer and I'm drooling on making a 34k in C-class and looking at something like this:

OSL-LHR-CPH-SEA-PDX-SFO-NRT-HKG-SIN-BNE-SIN-BKK-HKG-NRT-PEK-CPH

Thats somewhere in the ballpark of 34k and I need to get all the fun bits into it.

Hope my rambling helps