Need Advice on new Rims & Tyres for my Zen Diesel

I am using an Zen Diesel 2001 Model, the car has done some 1.2 Lac KM, the car does around 3000 KM per Month, 99% city driving, off late, the car has started to wooble, and there is vibration on the steering, my Alignment guy has advised me to Change the rims when i does a Next Tyre change, which is due now. The tubed tyres are going to cost me around 2200 per tyre and 1800 for the rim (Normal Rims at Maruti Service Center) each. that is coming to some 18000 for total replacement on all the five. If i opt for Alloy Wheels and Tubeless tyres (Shopwala says tubeless and normal Rims doesn’t work well and that too in a Old Diesel ZEN where Weight in the front is Lot due to a heavy weight Engine), how much will alloy wheels & tubeless cost me, whether it is needed, because i dont want any cosmetic looks, i just want a good ride quality, and a less worry about the punctures. Please Advise regarding this Avis