huhu..welcome to da club..hehe.

hmm... this needs some diagnosis.. again..start do maintance changing stuff 1st.. from fuel,ignition n air . carb cleaner, air filter, spark plug, cable, distributor cap , rotor n etc

if the wheel bearing oil seal gone case, better change the wheel bearings too as it might be contaminated by sand/dirt/water etc.

and yes as low yat 82 said, better change the timing belt.

as for water pump, if it is leaking then change, else you could prolly leave it alone. then again, it cost less than rm100, if you're working on the timing belt already, and if you got the extra cash lying around, might as well change

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Added on September 23, 2012, 4:45 am

front or rear, you need to identify.
as i mentioned before: the sound came up after change rims? probably need to look at rim offset/spacer etc.

if you friend with tire shops, ask them do on wheel balancing on your wheels. then ask them to have the spin adjusted at the speed you experience the noise ( some, if not all on wheel balancing machines can define speed)

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Added on September 23, 2012, 4:46 am

basically start with what low yat 82 mentioned.

also whens the last time you did OCI and changed your gear box fluid?

start with the OCI's then since you dont even know when's the last time you did it and even stated that it's been a long time.

cheapo mainstream mineral oils (shell, mobil, castrol etc) maybe rm50-60? for 4 liters (our engine needs around 3-3.5 liters, basically dont overfill it beyond the max line)

then manual gear oil maybe around/under rm50?

maybe can do a full flush for the engine (engine flush cost between rm30-50, can look up elton aka thundergod_cid LYN ID for his lambda flush)

not sure if manual gear box got filters, if yes probably can do a flush and replace that too along with a new gear box gasket (required when you open up the gearbox sump to remove the filter)
(this could cost between rm100-200)

get those basics down first then we slowly work on the rest if your problem(s) still persist

=edit=
oh ya lets not forget lowyat82 suggestions earlier, since you're doing OCI, might as well do these together (not everything that he suggested):
- fuel filter cost around/under rm10
- spark plugs (rm30-40+ for all 4 pieces NGK/bosch OEM)
- carb cleaner (rm45? look for elton aka thundergod_cid, he can do it for you)
- air filter rm5-10+
- bosch spark plug cable rm50 give/take (can look for wan LYN forumer "monkey king")