It took more than a year to sell R3 (since soft launch in July 2007).. but I think R2 will be selling better despite the slight increase in selling price..
couple of reason why I think R2 will sell better..
1) when R3 was launch, there are several competitor products around, particularly Zest and maybe Zen and Atmosfera.. Since Zest is 100% sold out, thus leaving SW more or less the only option to be considered right now..
2) The LRT news will definately give some sort of impact on decision making..
3) R2 offers more 845sqft units than the bigger ones... With the history of R3 had proven that 845sqft units sells better than 1007sqft unit and other bigger build-up units.
4) Upgrade in interior.
5) With property market moving up again and it seems the economy down turn is recovering, everyone trying to get a piece at this moment before the price reach sky high.. Puchong market seems to be hot and only SW still have plenty to sell..
6) Low entry cost plus 2.5% rebate will be attractive for buyers..
my 2 cents..

I got the same thinking as you.
I think is it worth to add another RM60k to get the 2 rooms unit. In short, 60k can get you one more bedroom, one more car park & one more bathroom. Additional loan installment only RM350 which I think prospect tenants willing to pay, maybe RM400-RM500 more.
Hope I am not wrong....