Have you seen pics of the acrylic tank? If its really scratched up, it takes alot of work to buff out the scratches. If it's in good condition, than yeah it's a good deal.
i think thats a great deal. and you need a lot more filtration than just that. I have a 125 and I have 2 ac110s and 1 eheim pro II 2028! I would suggest at least 2 ac110s and a rena xp3 or xp4
Right now the stocklist looks like it can be handled by a single AC110. When things get larger, you'll need a larger tank and more filtration though. (Assuming CKs to 18"+ and RTC to 30"+)