Anchor and fish finder

Hi lads

I was just wondering what is the best weight anchors to use and any thoughts on a fishfinder nav system for around 120 euros

regards Mark

I use a 2.5 kg Bruce type and approx the same in chain for my 14 foot cjr,its never let me down on Carlingford tides. As for fish finders I got my Garmin fishfinder 90 on Ebay for £60