How big of an HPS for this space..

My space is 3 feet tall, 2 1/2ft wide, and 2 feet deep..
I was thinkin a 175wt hps?

175 should be fine

thats not much room for an HPS, you might wanna try growing with CFLs in a space that confined

way too small for hps, the plants wont have any room to grow.

200 watt cfl would do great.