If its own stay, Tmn Desa will still be a better choice....
For better maintained prop with your criteria....
Freehold, u may try your luck at Faber Height, 2bedroom..... Thou most are asking slightly above 500k......
If u don't mind leasehold, then can go for Abadi Villa..... 3bedroom, 1200sf, u shld be able to get below 500k.....
Slightly lower range, u can have Danau Idaman, Danau Impian..... Still ok for own stay.....

Add new guardhouse?? What do u mean?
Some of those piping hav been added/replace...... Thou not too sure if there still more work to be done..... But if I'm not wrong, most owners hav already paid up those refurbishment cost quite some time.....
Staying in Tmn Desa never go wrong....   

faber height is one of those condo which is old but proven to be well managed. For own stay is not a bad choice if u dun mind the outlook and age

Alot of "second milk" here too...I have also seen Porche before.