I've been doing the same, but found out something quite fun at the same time.
Like you i'm trying to get some money together for a house, plan is to have a nice big sum in about 2 years.
I got my Tf's out of my mums attic, put all the ones that were boxed back up there, sat down and went through each one i had, all the ones that were complete i kept (for sale in the future) then all the ones i likes i also kept.
This shrunk the collection by about 1/3, which then went on ebay, single lots, and made me about £400 for about 40 odd figures, which wasnt bad as they were either incomplete or damaged.
This then led me to saving £200, and spluging £200 on Tf's, i boughts some lots of about 20-60 Tf's each for under £100, kept the complete ones, and the ones i liked, sold the rest, made another £400.
If you have the time clearing out your collection can result in money gains, and Tf gains, for instance i sold grimlock, slag, snarl sludge, all damaged, only sludge has his weapons, in lot for £80 (started at 99p) and went and bought masterpiece Grimlock.
at the end of the day it depends on what you want, and what time you have, i'd advocate keeping the ones you like, and going from there, good luck with the house hunt
I'm also looking for G1 Scattershot - complete with all parts for computron (i've got all the other techno bots, just not got their leader! If you have him and are looking to sell or swap for something please let me know - cheers