I am very happy with my CPA it has serve me well. Very accurate with a great trigger. 
Scott

I assume that they are over priced or they would have bids
Keep comments coming about what I should buy

Most any rifle you find used will most likely need a new or relined barrel. There are a number of good actions out ther that will make very good rifles for this.  A#2 remington rolling block, a 1 1/2 rolling block, Winchester low wall, hepburn, Even a high wall can be used but can be a pain to get the fired case out of. The CPA and a Winchester low wall are probably the easiest to get a case in and out of. The CPA does give you the option of changing barrels to give you a center fire rifle with the same configuration as your RF. 
I have worked as a Range Officer for a number of 22 bpcr matches and have seen a wide variety of rifles used. I don't think any particular action holds an edge over any other. The barrel may be a different story but reguardless of your barrel, its finding the ammunition that it likes best and then stock up on that brand/lot. Most .22 ammunition in a good barrel will shoot good to 100, the real test is how well it holds up at 200.   
One thing for sure is it is a whole bunch of fun, hands down. Can be frustrating at times but the fun outweighs that. 
Sam

I just looked at the 44 1/2 22 LR rifles on Gunbroker. Way over priced someone is looking to hit a homerun off an uninformed consumer. Even at a good price I would pass on those rifles for 22 BPCR. The configuration doesn't loan itself to the shooting discipline and are more than likely not accurate enough.

And just a reminder that it doesn't have to be a CPA 44 1/2 to be able to interchange barrels. An original Stevens 44 1/2 works just as well.

Things I look for in a target rifle, ranked.

Does it meet competition rules, at the top edge, using up all the available advantages without going over

Is the barrel up to the matches standard, realistic accuracy, not one off bragging groups.

Sight’s absolutely precise repeatable & easily adjusted 

Best trigger available is essential 

Is it stocked to fit me.

Can I keep the gun running myself. Spare parts, ease of replacement, springs firing pins etc. And will the maker perform more extensive repairs promptly 

CPA has met all my requirements since 1992

Boats

If a cpa can be made to fit the budget I'd go that way.  Mine is a schuetzen model so not bpcr 22 legal, but it shoots fantastically well.  I used to use a Crossno liner which is surprisingly good.  Under ideal weather conditions it has more than once shot 10 shot moa groups at 100m.  However it needed expensive rws ammo to do it.  My CPA with a Douglas XX barrel shoots a little better with SK Standard Plus which is way cheaper.  It likes expensive ammo even more of course, but is still very good with the SK Std Plus.

Chris.