两点比较关键
1) 认购=to subscribe
2) 套数 中的“套”在此不宜翻出为“set”及类似词，仅为一个量词，就像“一眼井”中的眼不能用“Eye”一样：-）
其他的都可迎刃而解。具体参考信息见下：

现房
completed apartment/flat
completed apartmentflat 现房指已建好供销售的房子 forward housing delivery 期房 corner.youth.cn
complete department(or flat)
现房complete departmentor flat. 期房forward delivery housing. 商品房commercial www.24en.com
completed apartment(or flat)
现房completed apartmentor flat 县改市county upgraded to city 现货交易spot language.chinadaily.com.cn
completed apartment(flat)
completed apartmentflat 现房. forward delivery housing 期房. economically www.onlycollege.com.cn

Dr.eye Online

期房
1.forward delivery housing; futures house

期房
Related phrases: 期房期房 期 房
期房是指开发商从取得商品房预售许可证开始至取得房地产权证大产证止，在这一期间的商品房称为期房 ...
q.sohu.com/forum/6/topic/4881120

C-E Jurisprudence Dictionary

期房
futures marketable housing

认购
EIPO
港人认购新股，一般有四种形式，包括白表认购、黄表认购、电子方式认购(eIPO)及白
表eIPO 等。白表认购是散户最普遍使用的 ... finance.sina.com.cn
subscribe
subscribe v 认购 subsidiary n 子公司 subsidise v 补贴资助 subsidy n 补助金 www.edu24ol.com
subscribe to
认购subscribe to 支票帐户checking account 货币控制工具instruments of monetry www.sd-trade.com
subscription
structure of industry 产业结构. Subscription 认购认股 subscription right 认股权 www.52en.com

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Note added at 1 heure (2009-10-18 14:59:46 GMT)
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限于答案简要中词数限制，将全部建议记于此：
期房(现房)住宅认购套数=subscribed quantity/number of forward delivery housing/futures (marketable) houses/appartments(completed appartments/houses) Sorry for my typo with the answer summary

If you prefer, you can also put it in this structure: quantity/number of subscribed...

Hope this helps...