I'm quite surprised you claim to have searched the forum and can't find the answers you're looking for??

If you look up the older threads, before all the "advertisements" took over, there's actually plenty of info.
In the first place, what type of answers ARE you looking for??
Also, it's kind of demanding of you to ask for a list of ALL the HCs/spas around the area don't you think? Shouldn't you ask for recommendations of places to go to instead??
Anyway, just to set you on your way, some have already been mentioned by others:-
1) Sky River is located at the back of Fahrenheit 88. Stocks are usually PRCs only. Don't cater for some bros (not muhibah). Used to have the best looking PRCs around, but that was a loooooong time back already (as in 2 World Cups ago!).
2) E2 is in Wisma MPL (formerly Wisma HLA), opposite the Weld on Raja Chulan. Same management as Saboon, but Saboon is a little off the beaten path so may be a better idea to go here instead. Lifts to E2 is a little tricky to find as well, but the E2 thread provides details. Together with Saboon, probably has the largest stocks in KL nowadays. Has all kinds from locals, PRCs, Indo and Viets.
3) Saboon is in an old block of apartments called Seasons Towers off Jalan Imbi. Not easy to find if you're not familiar with KL. Also, it's a bit tricky since it's located in an apartment block with residents pottering about! Both Saboon and E2 have decent spa facilities and also food which is cooked to order.
4) Cititel in Midvalley has a spa but is usually crowded and the girls are hit and miss, as the girls are usually rushing in order to rack up more clients. If you don't ask for it, they won't even let you view the girls!
5) Senspa in Boulevard Hotel, also in Midvalley has less crowd, but also less girls. Quality is pretty good and most of the Capts are friendly. Ask for Loke who's quite honest with recommendations.
There are many others, but these are the main ones nowadays. Federal Hotel and JJ Spa in Menara MAA are not too bad as well. Others like Genesis in Menara Genesis or Green Elephant in Sg. Wang have limited girls and quality is only 6/10 at best.
Search the older threads for the respective threads to these places for more info!